31120121223320 has 32 divisors (see below), whose sum is σ = 73064632439520. Its totient is φ = 11906828989440.

The previous prime is 31120121223313. The next prime is 31120121223329. The reversal of 31120121223320 is 2332212102113.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120121223329) 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 7 ways as a sum of consecutive naturals, for example, 16913108441 + ... + 16913110280.

It is an arithmetic number, because the mean of its divisors is an integer number (2283269763735).

Almost surely, 2^{31120121223320} is an apocalyptic number.

It is an amenable number.

31120121223320 is an abundant number, since it is smaller than the sum of its proper divisors (41944511216200).

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

31120121223320 is a wasteful number, since it uses less digits than its factorization.

31120121223320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33826218755 (or 33826218751 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31120121223320 its reverse (2332212102113), we get a palindrome (33452333325433).

The spelling of 31120121223320 in words is "thirty-one trillion, one hundred twenty billion, one hundred twenty-one million, two hundred twenty-three thousand, three hundred twenty".