31220121312252 has 72 divisors (see below), whose sum is σ = 83000298326400. Its totient is φ = 9880987858560.

The previous prime is 31220121312181. The next prime is 31220121312253. The reversal of 31220121312252 is 25221312102213.

31220121312252 is a `hidden beast` number, since 3 + 1 + 220 + 1 + 213 + 1 + 225 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220121312253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263856127 + ... + 263974422.

It is an arithmetic number, because the mean of its divisors is an integer number (1152781921200).

Almost surely, 2^{31220121312252} is an apocalyptic number.

It is an amenable number.

31220121312252 is an abundant number, since it is smaller than the sum of its proper divisors (51780177014148).

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

31220121312252 is a wasteful number, since it uses less digits than its factorization.

31220121312252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527830643 (or 527830638 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 31220121312252 its reverse (25221312102213), we get a palindrome (56441433414465).

The spelling of 31220121312252 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-one million, three hundred twelve thousand, two hundred fifty-two".