31221530032 has 80 divisors (see below), whose sum is σ = 77456685312. Its totient is φ = 11835452160.

The previous prime is 31221530023. The next prime is 31221530033. The reversal of 31221530032 is 23003512213.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31221529985 and 31221530012.

It is not an unprimeable number, because it can be changed into a prime (31221530033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296878 + ... + 388045.

Almost surely, 2^31221530032 is an apocalyptic number.

It is an amenable number.

31221530032 is an abundant number, since it is smaller than the sum of its proper divisors (46235155280).

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

31221530032 is a wasteful number, since it uses less digits than its factorization.

31221530032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684986 (or 684980 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The spelling of 31221530032 in words is "thirty-one billion, two hundred twenty-one million, five hundred thirty thousand, thirty-two".