21924748994 has 4 divisors (see below), whose sum is σ = 32887123494. Its totient is φ = 10962374496.

The previous prime is 21924748991. The next prime is 21924748997. The reversal of 21924748994 is 49984742912.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21924748991) and next prime (21924748997).

It can be written as a sum of positive squares in only one way, i.e., 19338517969 + 2586231025 = 139063^2 + 50855^2 .

It is not an unprimeable number, because it can be changed into a prime (21924748991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5481187247 + ... + 5481187250.

Almost surely, 2^21924748994 is an apocalyptic number.

21924748994 is a deficient number, since it is larger than the sum of its proper divisors (10962374500).

21924748994 is a wasteful number, since it uses less digits than its factorization.

21924748994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10962374499.

The product of its digits is 10450944, while the sum is 59.

The spelling of 21924748994 in words is "twenty-one billion, nine hundred twenty-four million, seven hundred forty-eight thousand, nine hundred ninety-four".