21924748988 has 12 divisors (see below), whose sum is σ = 40036498320. Its totient is φ = 10485749472.

The previous prime is 21924748961. The next prime is 21924748991. The reversal of 21924748988 is 88984742912.

It is a self number, because there is not a number n which added to its sum of digits gives 21924748988.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119156153 + ... + 119156336.

It is an arithmetic number, because the mean of its divisors is an integer number (3336374860).

Almost surely, 2^21924748988 is an apocalyptic number.

It is an amenable number.

21924748988 is a deficient number, since it is larger than the sum of its proper divisors (18111749332).

21924748988 is a wasteful number, since it uses less digits than its factorization.

21924748988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238312516 (or 238312514 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 62.

The spelling of 21924748988 in words is "twenty-one billion, nine hundred twenty-four million, seven hundred forty-eight thousand, nine hundred eighty-eight".