202010000021 has 2 divisors, whose sum is σ = 202010000022. Its totient is φ = 202010000020.

The previous prime is 202009999999. The next prime is 202010000057. The reversal of 202010000021 is 120000010202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116544400996 + 85465599025 = 341386^2 + 292345^2 .

It is a cyclic number.

It is not a de Polignac number, because 202010000021 - 2²² = 202005805717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202009999963 and 202010000008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202010000081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101005000010 + 101005000011.

It is an arithmetic number, because the mean of its divisors is an integer number (101005000011).

Almost surely, 2^202010000021 is an apocalyptic number.

It is an amenable number.

202010000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202010000021 is an equidigital number, since it uses as much as digits as its factorization.

202010000021 is an evil number, because the sum of its binary digits is even.

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

Adding to 202010000021 its reverse (120000010202), we get a palindrome (322010010223).

The spelling of 202010000021 in words is "two hundred two billion, ten million, twenty-one", and thus it is an aban number.