31211201120 has 96 divisors (see below), whose sum is σ = 81269498016. Its totient is φ = 11232460800.

The previous prime is 31211201113. The next prime is 31211201137. The reversal of 31211201120 is 2110211213.

It is a junction number, because it is equal to n+sod(n) for n = 31211201095 and 31211201104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79310 + ... + 262130.

It is an arithmetic number, because the mean of its divisors is an integer number (846557271).

Almost surely, 2^31211201120 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 31211201120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40634749008).

31211201120 is an abundant number, since it is smaller than the sum of its proper divisors (50058296896).

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

31211201120 is a wasteful number, since it uses less digits than its factorization.

31211201120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182944 (or 182936 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 31211201120 its reverse (2110211213), we get a palindrome (33321412333).

The spelling of 31211201120 in words is "thirty-one billion, two hundred eleven million, two hundred one thousand, one hundred twenty".