202021021957 has 2 divisors, whose sum is σ = 202021021958. Its totient is φ = 202021021956.

The previous prime is 202021021949. The next prime is 202021021967. The reversal of 202021021957 is 759120120202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153288693441 + 48732328516 = 391521^2 + 220754^2 .

It is a cyclic number.

It is not a de Polignac number, because 202021021957 - 2³ = 202021021949 is a prime.

It is a super-2 number, since 2×202021021957² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202021021967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010510978 + 101010510979.

It is an arithmetic number, because the mean of its divisors is an integer number (101010510979).

Almost surely, 2^202021021957 is an apocalyptic number.

It is an amenable number.

202021021957 is a deficient number, since it is larger than the sum of its proper divisors (1).

202021021957 is an equidigital number, since it uses as much as digits as its factorization.

202021021957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 202021021957 in words is "two hundred two billion, twenty-one million, twenty-one thousand, nine hundred fifty-seven".