31232223120 has 160 divisors (see below), whose sum is σ = 111083390208. Its totient is φ = 7110918144.

The previous prime is 31232223091. The next prime is 31232223173. The reversal of 31232223120 is 2132223213.

It is a happy number.

It is a super-2 number, since 2×31232223120² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 395592 + ... + 467928.

Almost surely, 2^31232223120 is an apocalyptic number.

31232223120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31232223120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55541695104).

31232223120 is an abundant number, since it is smaller than the sum of its proper divisors (79851167088).

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

31232223120 is a wasteful number, since it uses less digits than its factorization.

31232223120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72617 (or 72611 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31232223120 its reverse (2132223213), we get a palindrome (33364446333).

The spelling of 31232223120 in words is "thirty-one billion, two hundred thirty-two million, two hundred twenty-three thousand, one hundred twenty".