31220403332 has 24 divisors (see below), whose sum is σ = 55985438040. Its totient is φ = 15224797440.

The previous prime is 31220403311. The next prime is 31220403349. The reversal of 31220403332 is 23330402213.

It can be written as a sum of positive squares in 4 ways, for example, as 677248576 + 30543154756 = 26024^2 + 174766^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31220403298 and 31220403307.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541478 + ... + 596354.

It is an arithmetic number, because the mean of its divisors is an integer number (2332726585).

Almost surely, 2^31220403332 is an apocalyptic number.

It is an amenable number.

31220403332 is a deficient number, since it is larger than the sum of its proper divisors (24765034708).

31220403332 is a wasteful number, since it uses less digits than its factorization.

31220403332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58391 (or 58389 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 31220403332 its reverse (23330402213), we get a palindrome (54550805545).

The spelling of 31220403332 in words is "thirty-one billion, two hundred twenty million, four hundred three thousand, three hundred thirty-two".