31232112021 has 12 divisors (see below), whose sum is σ = 49214237280. Its totient is φ = 18928552680.

The previous prime is 31232112019. The next prime is 31232112031. The reversal of 31232112021 is 12021123213.

31232112021 is a `hidden beast` number, since 312 + 321 + 12 + 0 + 21 = 666.

It is not a de Polignac number, because 31232112021 - 2¹ = 31232112019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31232111985 and 31232112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31232112031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157737841 + ... + 157738038.

It is an arithmetic number, because the mean of its divisors is an integer number (4101186440).

Almost surely, 2^31232112021 is an apocalyptic number.

It is an amenable number.

31232112021 is a deficient number, since it is larger than the sum of its proper divisors (17982125259).

31232112021 is a wasteful number, since it uses less digits than its factorization.

31232112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315475896 (or 315475893 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31232112021 its reverse (12021123213), we get a palindrome (43253235234).

The spelling of 31232112021 in words is "thirty-one billion, two hundred thirty-two million, one hundred twelve thousand, twenty-one".