213251730 has 32 divisors (see below), whose sum is σ = 520198848. Its totient is φ = 55934400.

The previous prime is 213251729. The next prime is 213251771. The reversal of 213251730 is 37152312.

It is a self number, because there is not a number n which added to its sum of digits gives 213251730.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56436 + ... + 60095.

It is an arithmetic number, because the mean of its divisors is an integer number (16256214).

Almost surely, 2^213251730 is an apocalyptic number.

213251730 is an abundant number, since it is smaller than the sum of its proper divisors (306947118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213251730 is a wasteful number, since it uses less digits than its factorization.

213251730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116602.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 213251730 is about 14603.1411004619. The cubic root of 213251730 is about 597.4444361652. Note that the first 4 decimals are identical.

The spelling of 213251730 in words is "two hundred thirteen million, two hundred fifty-one thousand, seven hundred thirty".