31616304326221 has 8 divisors (see below), whose sum is σ = 33053290966080. Its totient is φ = 30241682387356.

The previous prime is 31616304326137. The next prime is 31616304326231. The reversal of 31616304326221 is 12262340361613.

It is not a de Polignac number, because 31616304326221 - 2⁹ = 31616304325709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31616304326231) 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 7 ways as a sum of consecutive naturals, for example, 1299252415 + ... + 1299276748.

It is an arithmetic number, because the mean of its divisors is an integer number (4131661370760).

Almost surely, 2^{31616304326221} is an apocalyptic number.

It is an amenable number.

31616304326221 is a deficient number, since it is larger than the sum of its proper divisors (1436986639859).

31616304326221 is an frugal number, since it uses more digits than its factorization.

31616304326221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598529232 (or 2598529186 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 40.

Adding to 31616304326221 its reverse (12262340361613), we get a palindrome (43878644687834).

The spelling of 31616304326221 in words is "thirty-one trillion, six hundred sixteen billion, three hundred four million, three hundred twenty-six thousand, two hundred twenty-one".