20201000010021 has 12 divisors (see below), whose sum is σ = 29179417557472. Its totient is φ = 13467243191976.

The previous prime is 20201000010013. The next prime is 20201000010043. The reversal of 20201000010021 is 12001000010202.

It is not a de Polignac number, because 20201000010021 - 2³ = 20201000010013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20201000009985 and 20201000010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201000010011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6078721 + ... + 8795046.

Almost surely, 2^{20201000010021} is an apocalyptic number.

It is an amenable number.

20201000010021 is a deficient number, since it is larger than the sum of its proper divisors (8978417547451).

20201000010021 is a wasteful number, since it uses less digits than its factorization.

20201000010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15024680 (or 15024677 counting only the distinct ones).

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

Adding to 20201000010021 its reverse (12001000010202), we get a palindrome (32202000020223).

The spelling of 20201000010021 in words is "twenty trillion, two hundred one billion, ten thousand, twenty-one".