31220121312232 has 16 divisors (see below), whose sum is σ = 58538440684260. Its totient is φ = 15609870463104.

The previous prime is 31220121312181. The next prime is 31220121312253. The reversal of 31220121312232 is 23221312102213.

It can be written as a sum of positive squares in 2 ways, for example, as 30299454196036 + 920667116196 = 5504494^2 + 959514^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31220121312197 and 31220121312206.

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, 23075283 + ... + 24390754.

Almost surely, 2^{31220121312232} is an apocalyptic number.

It is an amenable number.

31220121312232 is a deficient number, since it is larger than the sum of its proper divisors (27318319372028).

31220121312232 is a wasteful number, since it uses less digits than its factorization.

31220121312232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47548260 (or 47548256 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 31220121312232 its reverse (23221312102213), we get a palindrome (54441433414445).

The spelling of 31220121312232 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-one million, three hundred twelve thousand, two hundred thirty-two".