21924749051 has 4 divisors (see below), whose sum is σ = 22202277600. Its totient is φ = 21647220504.

The previous prime is 21924749029. The next prime is 21924749089. The reversal of 21924749051 is 15094742912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21924749051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21924748993 and 21924749011.

It is not an unprimeable number, because it can be changed into a prime (21924749351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138764156 + ... + 138764313.

It is an arithmetic number, because the mean of its divisors is an integer number (5550569400).

Almost surely, 2^21924749051 is an apocalyptic number.

21924749051 is a deficient number, since it is larger than the sum of its proper divisors (277528549).

21924749051 is an equidigital number, since it uses as much as digits as its factorization.

21924749051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277528548.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 21924749051 in words is "twenty-one billion, nine hundred twenty-four million, seven hundred forty-nine thousand, fifty-one".