31012220032 has 32 divisors (see below), whose sum is σ = 62829327600. Its totient is φ = 15243290880.

The previous prime is 31012220009. The next prime is 31012220053. The reversal of 31012220032 is 23002221013.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 31012219988 and 31012220015.

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, 2045694 + ... + 2060797.

Almost surely, 2^31012220032 is an apocalyptic number.

31012220032 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31012220032 is an abundant number, since it is smaller than the sum of its proper divisors (31817107568).

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

31012220032 is an equidigital number, since it uses as much as digits as its factorization.

31012220032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106564 (or 4106552 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31012220032 its reverse (23002221013), we get a palindrome (54014441045).

The spelling of 31012220032 in words is "thirty-one billion, twelve million, two hundred twenty thousand, thirty-two".