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20021010021 = 322224556669
BaseRepresentation
bin10010101001010110…
…000101111001100101
31220200022001200120200
4102221112011321211
5312000334310041
613110355421113
71306065530415
oct225126057145
956608050520
1020021010021
11854437a181
123a68bb4799
131b70b529bc
14d7cdd4645
157c2a1b1b6
hex4a9585e65

20021010021 has 6 divisors (see below), whose sum is σ = 28919236710. Its totient is φ = 13347340008.

The previous prime is 20021009999. The next prime is 20021010029. The reversal of 20021010021 is 12001012002.

It can be written as a sum of positive squares in only one way, i.e., 18854036100 + 1166973921 = 137310^2 + 34161^2 .

It is not a de Polignac number, because 20021010021 - 29 = 20021009509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2224556669 = 20021010021 / (2 + 0 + 0 + 2 + 1 + 0 + 1 + 0 + 0 + 2 + 1).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20021009985 and 20021010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021010029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112278326 + ... + 1112278343.

It is an arithmetic number, because the mean of its divisors is an integer number (4819872785).

Almost surely, 220021010021 is an apocalyptic number.

It is an amenable number.

20021010021 is a deficient number, since it is larger than the sum of its proper divisors (8898226689).

20021010021 is a wasteful number, since it uses less digits than its factorization.

20021010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224556675 (or 2224556672 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20021010021 its reverse (12001012002), we get a palindrome (32022022023).

The spelling of 20021010021 in words is "twenty billion, twenty-one million, ten thousand, twenty-one".

Divisors: 1 3 9 2224556669 6673670007 20021010021