31010032221 has 16 divisors (see below), whose sum is σ = 49740403200. Its totient is φ = 16787385648.

The previous prime is 31010032213. The next prime is 31010032237. The reversal of 31010032221 is 12223001013.

It is not a de Polignac number, because 31010032221 - 2³ = 31010032213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31010032221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31010032321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38859291 + ... + 38860088.

It is an arithmetic number, because the mean of its divisors is an integer number (3108775200).

Almost surely, 2^31010032221 is an apocalyptic number.

It is an amenable number.

31010032221 is a deficient number, since it is larger than the sum of its proper divisors (18730370979).

31010032221 is a wasteful number, since it uses less digits than its factorization.

31010032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77719408.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31010032221 its reverse (12223001013), we get a palindrome (43233033234).

The spelling of 31010032221 in words is "thirty-one billion, ten million, thirty-two thousand, two hundred twenty-one".