21923298180 has 72 divisors (see below), whose sum is σ = 76000771392. Its totient is φ = 5011039296.

The previous prime is 21923298167. The next prime is 21923298203. The reversal of 21923298180 is 8189232912.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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, 8698462 + ... + 8700981.

Almost surely, 2^21923298180 is an apocalyptic number.

21923298180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21923298180 is an abundant number, since it is smaller than the sum of its proper divisors (54077473212).

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

21923298180 is a wasteful number, since it uses less digits than its factorization.

21923298180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17399465 (or 17399460 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 21923298180 in words is "twenty-one billion, nine hundred twenty-three million, two hundred ninety-eight thousand, one hundred eighty".