31230331132221 has 32 divisors (see below), whose sum is σ = 50184631056000. Its totient is φ = 19080401503104.

The previous prime is 31230331132183. The next prime is 31230331132271. The reversal of 31230331132221 is 12223113303213.

31230331132221 is a `hidden beast` number, since 3 + 1 + 2 + 3 + 0 + 3 + 311 + 322 + 21 = 666.

It is not a de Polignac number, because 31230331132221 - 2²² = 31230326937917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230331132271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320006256 + ... + 320103833.

It is an arithmetic number, because the mean of its divisors is an integer number (1568269720500).

Almost surely, 2^{31230331132221} is an apocalyptic number.

It is an amenable number.

31230331132221 is a deficient number, since it is larger than the sum of its proper divisors (18954299923779).

31230331132221 is a wasteful number, since it uses less digits than its factorization.

31230331132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640110250 (or 640110244 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 31230331132221 its reverse (12223113303213), we get a palindrome (43453444435434).

The spelling of 31230331132221 in words is "thirty-one trillion, two hundred thirty billion, three hundred thirty-one million, one hundred thirty-two thousand, two hundred twenty-one".