21845994380 has 36 divisors (see below), whose sum is σ = 53366645808. Its totient is φ = 7490054880.

The previous prime is 21845994361. The next prime is 21845994413. The reversal of 21845994380 is 8349954812.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11144936 + ... + 11146895.

It is an arithmetic number, because the mean of its divisors is an integer number (1482406828).

Almost surely, 2^21845994380 is an apocalyptic number.

21845994380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21845994380 is an abundant number, since it is smaller than the sum of its proper divisors (31520651428).

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

21845994380 is a wasteful number, since it uses less digits than its factorization.

21845994380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22291854 (or 22291845 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 21845994380 in words is "twenty-one billion, eight hundred forty-five million, nine hundred ninety-four thousand, three hundred eighty".