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21122030021 = 731303222059
BaseRepresentation
bin10011101010111110…
…001001100111000101
32000112000211022002012
4103222332021213011
5321224214430041
613411530224005
71345265202311
oct235276114705
960460738065
1021122030021
118a59920864
124115885005
131cb7c9ca21
14104531ab41
158395043eb
hex4eaf899c5

21122030021 has 8 divisors (see below), whose sum is σ = 21427901760. Its totient is φ = 20816605152.

The previous prime is 21122030009. The next prime is 21122030023. The reversal of 21122030021 is 12003022112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21122030021 is a prime.

It is a super-2 number, since 2×211220300212 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122029978 and 21122030005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122030023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15911 + ... + 206148.

It is an arithmetic number, because the mean of its divisors is an integer number (2678487720).

Almost surely, 221122030021 is an apocalyptic number.

It is an amenable number.

21122030021 is a deficient number, since it is larger than the sum of its proper divisors (305871739).

21122030021 is a wasteful number, since it uses less digits than its factorization.

21122030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223435.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21122030021 its reverse (12003022112), we get a palindrome (33125052133).

The spelling of 21122030021 in words is "twenty-one billion, one hundred twenty-two million, thirty thousand, twenty-one".

Divisors: 1 73 1303 95119 222059 16210307 289342877 21122030021