31240252120 has 128 divisors (see below), whose sum is σ = 88081551360. Its totient is φ = 9687605760.

The previous prime is 31240252103. The next prime is 31240252133. The reversal of 31240252120 is 2125204213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31240252091 and 31240252100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 581017 + ... + 632503.

It is an arithmetic number, because the mean of its divisors is an integer number (688137120).

Almost surely, 2^31240252120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31240252120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44040775680).

31240252120 is an abundant number, since it is smaller than the sum of its proper divisors (56841299240).

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

31240252120 is a wasteful number, since it uses less digits than its factorization.

31240252120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51713 (or 51709 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 31240252120 its reverse (2125204213), we get a palindrome (33365456333).

The spelling of 31240252120 in words is "thirty-one billion, two hundred forty million, two hundred fifty-two thousand, one hundred twenty".