221031132 has 24 divisors (see below), whose sum is σ = 589416576. Its totient is φ = 63151728.

The previous prime is 221031119. The next prime is 221031143. The reversal of 221031132 is 231130122.

221031132 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221031132² = 97709522626402848, which contains 22 as substring.

It is a congruent number.

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, 1315578 + ... + 1315745.

It is an arithmetic number, because the mean of its divisors is an integer number (24559024).

Almost surely, 2^221031132 is an apocalyptic number.

It is an amenable number.

221031132 is an abundant number, since it is smaller than the sum of its proper divisors (368385444).

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

221031132 is a wasteful number, since it uses less digits than its factorization.

221031132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631337 (or 2631335 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221031132 is about 14867.1157929169. The cubic root of 221031132 is about 604.6227477579.

Adding to 221031132 its reverse (231130122), we get a palindrome (452161254).

The spelling of 221031132 in words is "two hundred twenty-one million, thirty-one thousand, one hundred thirty-two".