31330201221 has 96 divisors (see below), whose sum is σ = 56586729600. Its totient is φ = 16929492480.

The previous prime is 31330201213. The next prime is 31330201303. The reversal of 31330201221 is 12210203313.

It is not a de Polignac number, because 31330201221 - 2³ = 31330201213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31330201194 and 31330201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330201211) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1814095 + ... + 1831283.

It is an arithmetic number, because the mean of its divisors is an integer number (589445100).

Almost surely, 2^31330201221 is an apocalyptic number.

It is an amenable number.

31330201221 is a deficient number, since it is larger than the sum of its proper divisors (25256528379).

31330201221 is a wasteful number, since it uses less digits than its factorization.

31330201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17264 (or 17239 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31330201221 its reverse (12210203313), we get a palindrome (43540404534).

The spelling of 31330201221 in words is "thirty-one billion, three hundred thirty million, two hundred one thousand, two hundred twenty-one".