212012939857 has 2 divisors, whose sum is σ = 212012939858. Its totient is φ = 212012939856.

The previous prime is 212012939819. The next prime is 212012939947. The reversal of 212012939857 is 758939210212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126372429121 + 85640510736 = 355489^2 + 292644^2 .

It is a cyclic number.

It is not a de Polignac number, because 212012939857 - 2⁷ = 212012939729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212012939857.

It is not a weakly prime, because it can be changed into another prime (212012939357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106006469928 + 106006469929.

It is an arithmetic number, because the mean of its divisors is an integer number (106006469929).

Almost surely, 2^212012939857 is an apocalyptic number.

It is an amenable number.

212012939857 is a deficient number, since it is larger than the sum of its proper divisors (1).

212012939857 is an equidigital number, since it uses as much as digits as its factorization.

212012939857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 212012939857 in words is "two hundred twelve billion, twelve million, nine hundred thirty-nine thousand, eight hundred fifty-seven".