9221918872 has 32 divisors (see below), whose sum is σ = 18328651920. Its totient is φ = 4334883840.

The previous prime is 9221918863. The next prime is 9221918873. The reversal of 9221918872 is 2788191229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9221918873) 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, 85972 + ... + 160732.

Almost surely, 2^9221918872 is an apocalyptic number.

It is an amenable number.

9221918872 is a deficient number, since it is larger than the sum of its proper divisors (9106733048).

9221918872 is a wasteful number, since it uses less digits than its factorization.

9221918872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75691 (or 75687 counting only the distinct ones).

The product of its digits is 290304, while the sum is 49.

The square root of 9221918872 is about 96030.8225102753. The cubic root of 9221918872 is about 2097.0418570707.

The spelling of 9221918872 in words is "nine billion, two hundred twenty-one million, nine hundred eighteen thousand, eight hundred seventy-two".