31131320221112 has 64 divisors (see below), whose sum is σ = 60574230000000. Its totient is φ = 14981585351040.

The previous prime is 31131320221093. The next prime is 31131320221139. The reversal of 31131320221112 is 21112202313113.

It is a happy number.

It is a super-4 number, since 4×31131320221112⁴ (a number of 55 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 732497639 + ... + 732540137.

It is an arithmetic number, because the mean of its divisors is an integer number (946472343750).

Almost surely, 2^{31131320221112} is an apocalyptic number.

It is an amenable number.

31131320221112 is a deficient number, since it is larger than the sum of its proper divisors (29442909778888).

31131320221112 is a wasteful number, since it uses less digits than its factorization.

31131320221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52404 (or 52400 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31131320221112 its reverse (21112202313113), we get a palindrome (52243522534225).

The spelling of 31131320221112 in words is "thirty-one trillion, one hundred thirty-one billion, three hundred twenty million, two hundred twenty-one thousand, one hundred twelve".