2111121110957 has 2 divisors, whose sum is σ = 2111121110958. Its totient is φ = 2111121110956.

The previous prime is 2111121110953. The next prime is 2111121111017. The reversal of 2111121110957 is 7590111211112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1739394337321 + 371726773636 = 1318861^2 + 609694^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111121110957 - 2² = 2111121110953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111121110953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055560555478 + 1055560555479.

It is an arithmetic number, because the mean of its divisors is an integer number (1055560555479).

Almost surely, 2^{2111121110957} is an apocalyptic number.

It is an amenable number.

2111121110957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111121110957 is an equidigital number, since it uses as much as digits as its factorization.

2111121110957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 32.

The spelling of 2111121110957 in words is "two trillion, one hundred eleven billion, one hundred twenty-one million, one hundred ten thousand, nine hundred fifty-seven".