21924818556 has 24 divisors (see below), whose sum is σ = 51387323904. Its totient is φ = 7275499440.

The previous prime is 21924818533. The next prime is 21924818567. The reversal of 21924818556 is 65581842912.

It is a junction number, because it is equal to n+sod(n) for n = 21924818499 and 21924818508.

It is a congruent number.

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, 4093890 + ... + 4099241.

It is an arithmetic number, because the mean of its divisors is an integer number (2141138496).

Almost surely, 2^21924818556 is an apocalyptic number.

It is an amenable number.

21924818556 is an abundant number, since it is smaller than the sum of its proper divisors (29462505348).

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

21924818556 is a wasteful number, since it uses less digits than its factorization.

21924818556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8193361 (or 8193359 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 51.

The spelling of 21924818556 in words is "twenty-one billion, nine hundred twenty-four million, eight hundred eighteen thousand, five hundred fifty-six".