212791213 has 2 divisors, whose sum is σ = 212791214. Its totient is φ = 212791212.

The previous prime is 212791171. The next prime is 212791259. The reversal of 212791213 is 312197212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163763209 + 49028004 = 12797^2 + 7002^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212791213 is a prime.

It is a super-2 number, since 2×212791213² = 90560200660022738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212795213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106395606 + 106395607.

It is an arithmetic number, because the mean of its divisors is an integer number (106395607).

Almost surely, 2^212791213 is an apocalyptic number.

It is an amenable number.

212791213 is a deficient number, since it is larger than the sum of its proper divisors (1).

212791213 is an equidigital number, since it uses as much as digits as its factorization.

212791213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 212791213 is about 14587.3648408477. The cubic root of 212791213 is about 597.0140659052.

The spelling of 212791213 in words is "two hundred twelve million, seven hundred ninety-one thousand, two hundred thirteen".