213981288 has 32 divisors (see below), whose sum is σ = 535649760. Its totient is φ = 71234240.

The previous prime is 213981283. The next prime is 213981289. The reversal of 213981288 is 882189312.

It is a super-2 number, since 2×213981288² = 91575983228277888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213981281) 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, 14458 + ... + 25238.

It is an arithmetic number, because the mean of its divisors is an integer number (16739055).

Almost surely, 2^213981288 is an apocalyptic number.

It is an amenable number.

213981288 is an abundant number, since it is smaller than the sum of its proper divisors (321668472).

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

213981288 is a wasteful number, since it uses less digits than its factorization.

213981288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11617 (or 11613 counting only the distinct ones).

The product of its digits is 55296, while the sum is 42.

The square root of 213981288 is about 14628.0992613531. The cubic root of 213981288 is about 598.1249687558.

The spelling of 213981288 in words is "two hundred thirteen million, nine hundred eighty-one thousand, two hundred eighty-eight".