212115090557 has 2 divisors, whose sum is σ = 212115090558. Its totient is φ = 212115090556.

The previous prime is 212115090553. The next prime is 212115090611. The reversal of 212115090557 is 755090511212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186365753401 + 25749337156 = 431701^2 + 160466^2 .

It is a cyclic number.

It is not a de Polignac number, because 212115090557 - 2² = 212115090553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212115090557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212115090553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106057545278 + 106057545279.

It is an arithmetic number, because the mean of its divisors is an integer number (106057545279).

Almost surely, 2^212115090557 is an apocalyptic number.

It is an amenable number.

212115090557 is a deficient number, since it is larger than the sum of its proper divisors (1).

212115090557 is an equidigital number, since it uses as much as digits as its factorization.

212115090557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31500, while the sum is 38.

The spelling of 212115090557 in words is "two hundred twelve billion, one hundred fifteen million, ninety thousand, five hundred fifty-seven".