212657013 has 6 divisors (see below), whose sum is σ = 307171254. Its totient is φ = 141771336.

The previous prime is 212657009. The next prime is 212657021. The reversal of 212657013 is 310756212.

It is a happy number.

212657013 is a `hidden beast` number, since 2 + 1 + 2 + 657 + 0 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 198049329 + 14607684 = 14073^2 + 3822^2 .

It is not a de Polignac number, because 212657013 - 2² = 212657009 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212657033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11814270 + ... + 11814287.

It is an arithmetic number, because the mean of its divisors is an integer number (51195209).

Almost surely, 2^212657013 is an apocalyptic number.

It is an amenable number.

212657013 is a deficient number, since it is larger than the sum of its proper divisors (94514241).

212657013 is a wasteful number, since it uses less digits than its factorization.

212657013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23628563 (or 23628560 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 212657013 is about 14582.7642441342. The cubic root of 212657013 is about 596.8885341923. Note that the first 3 decimals are identical.

The spelling of 212657013 in words is "two hundred twelve million, six hundred fifty-seven thousand, thirteen".