213157817391 has 16 divisors (see below), whose sum is σ = 284455355904. Its totient is φ = 141982805664.

The previous prime is 213157817371. The next prime is 213157817401. The reversal of 213157817391 is 193718751312.

It is not a de Polignac number, because 213157817391 - 2⁵ = 213157817359 is a prime.

It is a super-2 number, since 2×213157817391² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213157817391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213157817351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22678905 + ... + 22688301.

It is an arithmetic number, because the mean of its divisors is an integer number (17778459744).

Almost surely, 2^213157817391 is an apocalyptic number.

213157817391 is a deficient number, since it is larger than the sum of its proper divisors (71297538513).

213157817391 is a wasteful number, since it uses less digits than its factorization.

213157817391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15110.

The product of its digits is 317520, while the sum is 48.

The spelling of 213157817391 in words is "two hundred thirteen billion, one hundred fifty-seven million, eight hundred seventeen thousand, three hundred ninety-one".