231421772 has 12 divisors (see below), whose sum is σ = 405114696. Its totient is φ = 115674720.

The previous prime is 231421763. The next prime is 231421781. The reversal of 231421772 is 277124132.

It is an interprime number because it is at equal distance from previous prime (231421763) and next prime (231421781).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9647 + ... + 23577.

It is an arithmetic number, because the mean of its divisors is an integer number (33759558).

Almost surely, 2^231421772 is an apocalyptic number.

It is an amenable number.

231421772 is a deficient number, since it is larger than the sum of its proper divisors (173692924).

231421772 is a wasteful number, since it uses less digits than its factorization.

231421772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18088 (or 18086 counting only the distinct ones).

The product of its digits is 4704, while the sum is 29.

The square root of 231421772 is about 15212.5531059057. The cubic root of 231421772 is about 613.9524520470.

The spelling of 231421772 in words is "two hundred thirty-one million, four hundred twenty-one thousand, seven hundred seventy-two".