31121233112 has 32 divisors (see below), whose sum is σ = 59607645120. Its totient is φ = 15226014720.

The previous prime is 31121233111. The next prime is 31121233127. The reversal of 31121233112 is 21133212113.

It is a happy number.

It is a super-2 number, since 2×31121233112² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121233111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2468168 + ... + 2480744.

It is an arithmetic number, because the mean of its divisors is an integer number (1862738910).

Almost surely, 2^31121233112 is an apocalyptic number.

It is an amenable number.

31121233112 is a deficient number, since it is larger than the sum of its proper divisors (28486412008).

31121233112 is a wasteful number, since it uses less digits than its factorization.

31121233112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19211 (or 19207 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 31121233112 its reverse (21133212113), we get a palindrome (52254445225).

The spelling of 31121233112 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty-three thousand, one hundred twelve".