231021132 has 24 divisors (see below), whose sum is σ = 544090176. Its totient is φ = 76286928.

The previous prime is 231021113. The next prime is 231021137. The reversal of 231021132 is 231120132.

It is a super-2 number, since 2×231021132² = 106741526861122848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231021137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88678 + ... + 91245.

It is an arithmetic number, because the mean of its divisors is an integer number (22670424).

Almost surely, 2^231021132 is an apocalyptic number.

It is an amenable number.

231021132 is an abundant number, since it is smaller than the sum of its proper divisors (313069044).

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

231021132 is a wasteful number, since it uses less digits than its factorization.

231021132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180037 (or 180035 counting only the distinct ones).

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

The square root of 231021132 is about 15199.3793294332. The cubic root of 231021132 is about 613.5979535783.

Adding to 231021132 its reverse (231120132), we get a palindrome (462141264).

The spelling of 231021132 in words is "two hundred thirty-one million, twenty-one thousand, one hundred thirty-two".