212312997 has 12 divisors (see below), whose sum is σ = 330264844. Its totient is φ = 130654080.

The previous prime is 212312987. The next prime is 212313029. The reversal of 212312997 is 799213212.

It can be written as a sum of positive squares in 2 ways, for example, as 113230881 + 99082116 = 10641^2 + 9954^2 .

It is not a de Polignac number, because 212312997 - 2⁷ = 212312869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212312917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 907204 + ... + 907437.

Almost surely, 2^212312997 is an apocalyptic number.

It is an amenable number.

212312997 is a deficient number, since it is larger than the sum of its proper divisors (117951847).

212312997 is a wasteful number, since it uses less digits than its factorization.

212312997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814660 (or 1814657 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 212312997 is about 14570.9641753729. The cubic root of 212312997 is about 596.5664975809.

The spelling of 212312997 in words is "two hundred twelve million, three hundred twelve thousand, nine hundred ninety-seven".