31210012321 has 16 divisors (see below), whose sum is σ = 32849349120. Its totient is φ = 29611071360.

The previous prime is 31210012319. The next prime is 31210012331. The reversal of 31210012321 is 12321001213.

It is a cyclic number.

It is not a de Polignac number, because 31210012321 - 2¹ = 31210012319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31210012295 and 31210012304.

It is not an unprimeable number, because it can be changed into a prime (31210012331) 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 15 ways as a sum of consecutive naturals, for example, 2430165 + ... + 2442973.

It is an arithmetic number, because the mean of its divisors is an integer number (2053084320).

Almost surely, 2^31210012321 is an apocalyptic number.

31210012321 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31210012321 is a deficient number, since it is larger than the sum of its proper divisors (1639336799).

31210012321 is a wasteful number, since it uses less digits than its factorization.

31210012321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14376.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31210012321 its reverse (12321001213), we get a palindrome (43531013534).

The spelling of 31210012321 in words is "thirty-one billion, two hundred ten million, twelve thousand, three hundred twenty-one".