31867221868 has 6 divisors (see below), whose sum is σ = 55767638276. Its totient is φ = 15933610932.

The previous prime is 31867221847. The next prime is 31867221929. The reversal of 31867221868 is 86812276813.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3983402730 + ... + 3983402737.

Almost surely, 2^31867221868 is an apocalyptic number.

It is an amenable number.

31867221868 is a deficient number, since it is larger than the sum of its proper divisors (23900416408).

31867221868 is a wasteful number, since it uses less digits than its factorization.

31867221868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7966805471 (or 7966805469 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 52.

Subtracting 31867221868 from its reverse (86812276813), we obtain a palindrome (54945054945).

The spelling of 31867221868 in words is "thirty-one billion, eight hundred sixty-seven million, two hundred twenty-one thousand, eight hundred sixty-eight".