213157715 has 8 divisors (see below), whose sum is σ = 256190928. Its totient is φ = 170258400.

The previous prime is 213157687. The next prime is 213157717. The reversal of 213157715 is 517751312.

213157715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213157715 - 2⁸ = 213157459 is a prime.

It is a super-2 number, since 2×213157715² = 90872422928042450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213157717) 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, 29936 + ... + 36365.

It is an arithmetic number, because the mean of its divisors is an integer number (32023866).

Almost surely, 2^213157715 is an apocalyptic number.

213157715 is a deficient number, since it is larger than the sum of its proper divisors (43033213).

213157715 is an equidigital number, since it uses as much as digits as its factorization.

213157715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66949.

The product of its digits is 7350, while the sum is 32.

The square root of 213157715 is about 14599.9217463656. The cubic root of 213157715 is about 597.3566260219.

The spelling of 213157715 in words is "two hundred thirteen million, one hundred fifty-seven thousand, seven hundred fifteen".