31212011120 has 20 divisors (see below), whose sum is σ = 72567926040. Its totient is φ = 12484804416.

The previous prime is 31212011111. The next prime is 31212011143. The reversal of 31212011120 is 2111021213.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 31212011095 and 31212011104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195074990 + ... + 195075149.

It is an arithmetic number, because the mean of its divisors is an integer number (3628396302).

Almost surely, 2^31212011120 is an apocalyptic number.

It is an amenable number.

31212011120 is an abundant number, since it is smaller than the sum of its proper divisors (41355914920).

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

31212011120 is a wasteful number, since it uses less digits than its factorization.

31212011120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390150152 (or 390150146 counting only the distinct ones).

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

Adding to 31212011120 its reverse (2111021213), we get a palindrome (33323032333).

The spelling of 31212011120 in words is "thirty-one billion, two hundred twelve million, eleven thousand, one hundred twenty".