31221325132 has 12 divisors (see below), whose sum is σ = 54920415256. Its totient is φ = 15529777920.

The previous prime is 31221325127. The next prime is 31221325133. The reversal of 31221325132 is 23152312213.

It is a super-2 number, since 2×31221325132² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31221325097 and 31221325106.

It is not an unprimeable number, because it can be changed into a prime (31221325133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20220294 + ... + 20221837.

Almost surely, 2^31221325132 is an apocalyptic number.

It is an amenable number.

31221325132 is a deficient number, since it is larger than the sum of its proper divisors (23699090124).

31221325132 is a wasteful number, since it uses less digits than its factorization.

31221325132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40442328 (or 40442326 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

Adding to 31221325132 its reverse (23152312213), we get a palindrome (54373637345).

The spelling of 31221325132 in words is "thirty-one billion, two hundred twenty-one million, three hundred twenty-five thousand, one hundred thirty-two".