20000010021 has 8 divisors (see below), whose sum is σ = 26747245344. Its totient is φ = 13293057360.

The previous prime is 20000010011. The next prime is 20000010083. The reversal of 20000010021 is 12001000002.

It is a happy number.

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

It is not a de Polignac number, because 20000010021 - 2¹³ = 20000001829 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20000009991 and 20000010009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000010011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10069506 + ... + 10071491.

It is an arithmetic number, because the mean of its divisors is an integer number (3343405668).

Almost surely, 2^20000010021 is an apocalyptic number.

It is an amenable number.

20000010021 is a deficient number, since it is larger than the sum of its proper divisors (6747235323).

20000010021 is a wasteful number, since it uses less digits than its factorization.

20000010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20141331.

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 20000010021 its reverse (12001000002), we get a palindrome (32001010023).

The spelling of 20000010021 in words is "twenty billion, ten thousand, twenty-one".