213357861 has 8 divisors (see below), whose sum is σ = 316085760. Its totient is φ = 142238556.

The previous prime is 213357847. The next prime is 213357869. The reversal of 213357861 is 168753312.

213357861 is a `hidden beast` number, since 21 + 3 + 3 + 578 + 61 = 666.

It is not a de Polignac number, because 213357861 - 2⁵ = 213357829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213357869) 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, 3951045 + ... + 3951098.

It is an arithmetic number, because the mean of its divisors is an integer number (39510720).

Almost surely, 2^213357861 is an apocalyptic number.

It is an amenable number.

213357861 is a deficient number, since it is larger than the sum of its proper divisors (102727899).

213357861 is an equidigital number, since it uses as much as digits as its factorization.

213357861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7902152 (or 7902146 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 213357861 is about 14606.7744899413. The cubic root of 213357861 is about 597.5435316638.

The spelling of 213357861 in words is "two hundred thirteen million, three hundred fifty-seven thousand, eight hundred sixty-one".