202102202201021 has 2 divisors, whose sum is σ = 202102202201022. Its totient is φ = 202102202201020.

The previous prime is 202102202200991. The next prime is 202102202201041. The reversal of 202102202201021 is 120102202201202.

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., 192051647392900 + 10050554808121 = 13858270^2 + 3170261^2 .

It is a cyclic number.

It is not a de Polignac number, because 202102202201021 - 2⁶ = 202102202200957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202102202201041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101051101100510 + 101051101100511.

It is an arithmetic number, because the mean of its divisors is an integer number (101051101100511).

Almost surely, 2^{202102202201021} is an apocalyptic number.

It is an amenable number.

202102202201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202102202201021 is an equidigital number, since it uses as much as digits as its factorization.

202102202201021 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 202102202201021 its reverse (120102202201202), we get a palindrome (322204404402223).

The spelling of 202102202201021 in words is "two hundred two trillion, one hundred two billion, two hundred two million, two hundred one thousand, twenty-one".