31320021322120 has 32 divisors (see below), whose sum is σ = 72374643869400. Its totient is φ = 12189413703168.

The previous prime is 31320021322097. The next prime is 31320021322133. The reversal of 31320021322120 is 2122312002313.

It can be written as a sum of positive squares in 4 ways, for example, as 29717827376836 + 1602193945284 = 5451406^2 + 1265778^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31320021322091 and 31320021322100.

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, 10581086805 + ... + 10581089764.

Almost surely, 2^{31320021322120} is an apocalyptic number.

It is an amenable number.

31320021322120 is an abundant number, since it is smaller than the sum of its proper divisors (41054622547280).

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

31320021322120 is a wasteful number, since it uses less digits than its factorization.

31320021322120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21162176617 (or 21162176613 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31320021322120 its reverse (2122312002313), we get a palindrome (33442333324433).

The spelling of 31320021322120 in words is "thirty-one trillion, three hundred twenty billion, twenty-one million, three hundred twenty-two thousand, one hundred twenty".