21840793420 has 24 divisors (see below), whose sum is σ = 45964747584. Its totient is φ = 8717444736.

The previous prime is 21840793411. The next prime is 21840793433. The reversal of 21840793420 is 2439704812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1170049 + ... + 1188568.

It is an arithmetic number, because the mean of its divisors is an integer number (1915197816).

Almost surely, 2^21840793420 is an apocalyptic number.

21840793420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21840793420 is an abundant number, since it is smaller than the sum of its proper divisors (24123954164).

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

21840793420 is a wasteful number, since it uses less digits than its factorization.

21840793420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359089 (or 2359087 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 21840793420 in words is "twenty-one billion, eight hundred forty million, seven hundred ninety-three thousand, four hundred twenty".