202012221200021 has 2 divisors, whose sum is σ = 202012221200022. Its totient is φ = 202012221200020.

The previous prime is 202012221200003. The next prime is 202012221200057. The reversal of 202012221200021 is 120002122210202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107011038808996 + 95001182391025 = 10344614^2 + 9746855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202012221200021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202012221205021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101006110600010 + 101006110600011.

It is an arithmetic number, because the mean of its divisors is an integer number (101006110600011).

Almost surely, 2^{202012221200021} is an apocalyptic number.

It is an amenable number.

202012221200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202012221200021 is an equidigital number, since it uses as much as digits as its factorization.

202012221200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202012221200021 its reverse (120002122210202), we get a palindrome (322014343410223).

The spelling of 202012221200021 in words is "two hundred two trillion, twelve billion, two hundred twenty-one million, two hundred thousand, twenty-one".