2021112011957 has 2 divisors, whose sum is σ = 2021112011958. Its totient is φ = 2021112011956.

The previous prime is 2021112011929. The next prime is 2021112012013. The reversal of 2021112011957 is 7591102111202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1445078068996 + 576033942961 = 1202114^2 + 758969^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021112011957 - 2⁸ = 2021112011701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021112011917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010556005978 + 1010556005979.

It is an arithmetic number, because the mean of its divisors is an integer number (1010556005979).

Almost surely, 2^{2021112011957} is an apocalyptic number.

It is an amenable number.

2021112011957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021112011957 is an equidigital number, since it uses as much as digits as its factorization.

2021112011957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 32.

The spelling of 2021112011957 in words is "two trillion, twenty-one billion, one hundred twelve million, eleven thousand, nine hundred fifty-seven".