202001021000021 has 2 divisors, whose sum is σ = 202001021000022. Its totient is φ = 202001021000020.

The previous prime is 202001020999891. The next prime is 202001021000039. The reversal of 202001021000021 is 120000120100202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163186700547025 + 38814320452996 = 12774455^2 + 6230114^2 .

It is a cyclic number.

It is not a de Polignac number, because 202001021000021 - 2⁴⁶ = 131632276822357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202001020999966 and 202001021000011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202001021000041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101000510500010 + 101000510500011.

It is an arithmetic number, because the mean of its divisors is an integer number (101000510500011).

Almost surely, 2^{202001021000021} is an apocalyptic number.

It is an amenable number.

202001021000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202001021000021 is an equidigital number, since it uses as much as digits as its factorization.

202001021000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 202001021000021 its reverse (120000120100202), we get a palindrome (322001141100223).

The spelling of 202001021000021 in words is "two hundred two trillion, one billion, twenty-one million, twenty-one", and thus it is an aban number.