31331122120 has 32 divisors (see below), whose sum is σ = 71287111800. Its totient is φ = 12391633408.

The previous prime is 31331122103. The next prime is 31331122127. The reversal of 31331122120 is 2122113313.

It can be written as a sum of positive squares in 4 ways, for example, as 29300538276 + 2030583844 = 171174^2 + 45062^2 .

It is not an unprimeable number, because it can be changed into a prime (31331122127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4396879 + ... + 4403998.

Almost surely, 2^31331122120 is an apocalyptic number.

It is an amenable number.

31331122120 is an abundant number, since it is smaller than the sum of its proper divisors (39955989680).

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

31331122120 is a wasteful number, since it uses less digits than its factorization.

31331122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8800977 (or 8800973 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31331122120 its reverse (2122113313), we get a palindrome (33453235433).

The spelling of 31331122120 in words is "thirty-one billion, three hundred thirty-one million, one hundred twenty-two thousand, one hundred twenty".