213261210 has 24 divisors (see below), whose sum is σ = 554479380. Its totient is φ = 56869632.

The previous prime is 213261203. The next prime is 213261227. The reversal of 213261210 is 12162312.

213261210 is a `hidden beast` number, since 21 + 32 + 612 + 1 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 196196049 + 17065161 = 14007^2 + 4131^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1184695 + ... + 1184874.

Almost surely, 2^213261210 is an apocalyptic number.

213261210 is an abundant number, since it is smaller than the sum of its proper divisors (341218170).

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

213261210 is a wasteful number, since it uses less digits than its factorization.

213261210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369582 (or 2369579 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 213261210 is about 14603.4656845558. The cubic root of 213261210 is about 597.4532890662.

The spelling of 213261210 in words is "two hundred thirteen million, two hundred sixty-one thousand, two hundred ten".