31119870921 has 8 divisors (see below), whose sum is σ = 41498944224. Its totient is φ = 20743689120.

The previous prime is 31119870871. The next prime is 31119870953. The reversal of 31119870921 is 12907891113.

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

It is not a de Polignac number, because 31119870921 - 2¹³ = 31119862729 is a prime.

It is a super-2 number, since 2×31119870921² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31119870961) 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, 697636 + ... + 740901.

It is an arithmetic number, because the mean of its divisors is an integer number (5187368028).

Almost surely, 2^31119870921 is an apocalyptic number.

It is an amenable number.

31119870921 is a deficient number, since it is larger than the sum of its proper divisors (10379073303).

31119870921 is a wasteful number, since it uses less digits than its factorization.

31119870921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445751.

The product of its (nonzero) digits is 27216, while the sum is 42.

The spelling of 31119870921 in words is "thirty-one billion, one hundred nineteen million, eight hundred seventy thousand, nine hundred twenty-one".