31608196921 has 8 divisors (see below), whose sum is σ = 36963738944. Its totient is φ = 26462676240.

The previous prime is 31608196903. The next prime is 31608196931. The reversal of 31608196921 is 12969180613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31608196921 - 2¹⁷ = 31608065849 is a prime.

It is a super-2 number, since 2×31608196921² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31608196931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52505010 + ... + 52505611.

It is an arithmetic number, because the mean of its divisors is an integer number (4620467368).

Almost surely, 2^31608196921 is an apocalyptic number.

It is an amenable number.

31608196921 is a deficient number, since it is larger than the sum of its proper divisors (5355542023).

31608196921 is a wasteful number, since it uses less digits than its factorization.

31608196921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105010671.

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 31608196921 in words is "thirty-one billion, six hundred eight million, one hundred ninety-six thousand, nine hundred twenty-one".