31221352121112 has 128 divisors (see below), whose sum is σ = 88259630961600. Its totient is φ = 10224645341184.

The previous prime is 31221352121051. The next prime is 31221352121117. The reversal of 31221352121112 is 21112125312213.

31221352121112 is a `hidden beast` number, since 3 + 1 + 2 + 2 + 1 + 3 + 521 + 21 + 112 = 666.

It is a super-2 number, since 2×31221352121112² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221352121117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2568033 + ... + 8308880.

Almost surely, 2^{31221352121112} is an apocalyptic number.

It is an amenable number.

31221352121112 is an abundant number, since it is smaller than the sum of its proper divisors (57038278840488).

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

31221352121112 is a wasteful number, since it uses less digits than its factorization.

31221352121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10877162 (or 10877152 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

Adding to 31221352121112 its reverse (21112125312213), we get a palindrome (52333477433325).

The spelling of 31221352121112 in words is "thirty-one trillion, two hundred twenty-one billion, three hundred fifty-two million, one hundred twenty-one thousand, one hundred twelve".