213157683891 has 8 divisors (see below), whose sum is σ = 315789161360. Its totient is φ = 142105122576.

The previous prime is 213157683853. The next prime is 213157683917. The reversal of 213157683891 is 198386751312.

213157683891 is a `hidden beast` number, since 2 + 1 + 31 + 576 + 8 + 38 + 9 + 1 = 666.

It is not a de Polignac number, because 213157683891 - 2¹⁷ = 213157552819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213157683391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3947364490 + ... + 3947364543.

It is an arithmetic number, because the mean of its divisors is an integer number (39473645170).

Almost surely, 2^213157683891 is an apocalyptic number.

213157683891 is a deficient number, since it is larger than the sum of its proper divisors (102631477469).

213157683891 is an equidigital number, since it uses as much as digits as its factorization.

213157683891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7894729042 (or 7894729036 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 213157683891 in words is "two hundred thirteen billion, one hundred fifty-seven million, six hundred eighty-three thousand, eight hundred ninety-one".