31013302221 has 32 divisors (see below), whose sum is σ = 50241767040. Its totient is φ = 18751219200.

The previous prime is 31013302217. The next prime is 31013302247. The reversal of 31013302221 is 12220331013.

31013302221 is a `hidden beast` number, since 310 + 1 + 330 + 2 + 2 + 21 = 666.

It is not a de Polignac number, because 31013302221 - 2² = 31013302217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31013302194 and 31013302203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013302421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1021 + ... + 249053.

It is an arithmetic number, because the mean of its divisors is an integer number (1570055220).

Almost surely, 2^31013302221 is an apocalyptic number.

It is an amenable number.

31013302221 is a deficient number, since it is larger than the sum of its proper divisors (19228464819).

31013302221 is a wasteful number, since it uses less digits than its factorization.

31013302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248474 (or 248468 counting only the distinct ones).

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

Adding to 31013302221 its reverse (12220331013), we get a palindrome (43233633234).

The spelling of 31013302221 in words is "thirty-one billion, thirteen million, three hundred two thousand, two hundred twenty-one".