213221132 has 24 divisors (see below), whose sum is σ = 393390816. Its totient is φ = 100919808.

The previous prime is 213221117. The next prime is 213221143. The reversal of 213221132 is 231122312.

It is a super-2 number, since 2×213221132² = 90926502262722848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213221132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3023 + ... + 20870.

It is an arithmetic number, because the mean of its divisors is an integer number (16391284).

Almost surely, 2^213221132 is an apocalyptic number.

It is an amenable number.

213221132 is a deficient number, since it is larger than the sum of its proper divisors (180169684).

213221132 is a wasteful number, since it uses less digits than its factorization.

213221132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24017 (or 24015 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 213221132 is about 14602.0934115626. The cubic root of 213221132 is about 597.4158604232.

Adding to 213221132 its reverse (231122312), we get a palindrome (444343444).

The spelling of 213221132 in words is "two hundred thirteen million, two hundred twenty-one thousand, one hundred thirty-two".