21423747792 has 20 divisors (see below), whose sum is σ = 55344681920. Its totient is φ = 7141249248.

The previous prime is 21423747757. The next prime is 21423747811. The reversal of 21423747792 is 29774732412.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 446328079 = 21423747792 / (2 + 1 + 4 + 2 + 3 + 7 + 4 + 7 + 7 + 9 + 2).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 223163992 + ... + 223164087.

It is an arithmetic number, because the mean of its divisors is an integer number (2767234096).

Almost surely, 2^21423747792 is an apocalyptic number.

It is an amenable number.

21423747792 is an abundant number, since it is smaller than the sum of its proper divisors (33920934128).

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

21423747792 is a wasteful number, since it uses less digits than its factorization.

21423747792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446328090 (or 446328084 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 48.

The spelling of 21423747792 in words is "twenty-one billion, four hundred twenty-three million, seven hundred forty-seven thousand, seven hundred ninety-two".