213021191 has 2 divisors, whose sum is σ = 213021192. Its totient is φ = 213021190.

The previous prime is 213021161. The next prime is 213021223. The reversal of 213021191 is 191120312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213021191 - 2¹⁴ = 213004807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213021161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106510595 + 106510596.

It is an arithmetic number, because the mean of its divisors is an integer number (106510596).

Almost surely, 2^213021191 is an apocalyptic number.

213021191 is a deficient number, since it is larger than the sum of its proper divisors (1).

213021191 is an equidigital number, since it uses as much as digits as its factorization.

213021191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 213021191 is about 14595.2454929679. The cubic root of 213021191 is about 597.2290664299.

The spelling of 213021191 in words is "two hundred thirteen million, twenty-one thousand, one hundred ninety-one".