31112121321 has 24 divisors (see below), whose sum is σ = 47778434496. Its totient is φ = 19465274400.

The previous prime is 31112121259. The next prime is 31112121347. The reversal of 31112121321 is 12312121113.

31112121321 is a `hidden beast` number, since 311 + 12 + 1 + 21 + 321 = 666.

It is not a de Polignac number, because 31112121321 - 2¹³ = 31112113129 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31112121294 and 31112121303.

It is not an unprimeable number, because it can be changed into a prime (31112121421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1406955 + ... + 1428896.

It is an arithmetic number, because the mean of its divisors is an integer number (1990768104).

Almost surely, 2^31112121321 is an apocalyptic number.

It is an amenable number.

31112121321 is a deficient number, since it is larger than the sum of its proper divisors (16666313175).

31112121321 is a wasteful number, since it uses less digits than its factorization.

31112121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835933 (or 2835930 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 31112121321 its reverse (12312121113), we get a palindrome (43424242434).

The spelling of 31112121321 in words is "thirty-one billion, one hundred twelve million, one hundred twenty-one thousand, three hundred twenty-one".