213012391 has 2 divisors, whose sum is σ = 213012392. Its totient is φ = 213012390.

The previous prime is 213012347. The next prime is 213012421. The reversal of 213012391 is 193210312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213012391 - 2⁷ = 213012263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213012301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106506195 + 106506196.

It is an arithmetic number, because the mean of its divisors is an integer number (106506196).

Almost surely, 2^213012391 is an apocalyptic number.

213012391 is a deficient number, since it is larger than the sum of its proper divisors (1).

213012391 is an equidigital number, since it uses as much as digits as its factorization.

213012391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 213012391 is about 14594.9440218180. The cubic root of 213012391 is about 597.2208423840.

The spelling of 213012391 in words is "two hundred thirteen million, twelve thousand, three hundred ninety-one".