9021791900 has 72 divisors (see below), whose sum is σ = 21377954640. Its totient is φ = 3277440000.

The previous prime is 9021791899. The next prime is 9021791903. The reversal of 9021791900 is 91971209.

It is a super-2 number, since 2×9021791900² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9021791903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1317686 + ... + 1324514.

Almost surely, 2^9021791900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9021791900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10688977320).

9021791900 is an abundant number, since it is smaller than the sum of its proper divisors (12356162740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9021791900 is a wasteful number, since it uses less digits than its factorization.

9021791900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8055 (or 8048 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 9021791900 is about 94983.1137623946. The cubic root of 9021791900 is about 2081.7613209202.

The spelling of 9021791900 in words is "nine billion, twenty-one million, seven hundred ninety-one thousand, nine hundred".