21944608747 has 4 divisors (see below), whose sum is σ = 21947394096. Its totient is φ = 21941823400.

The previous prime is 21944608711. The next prime is 21944608753. The reversal of 21944608747 is 74780644912.

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

It is a cyclic number.

It is not a de Polignac number, because 21944608747 - 2²⁷ = 21810391019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21944608694 and 21944608703.

It is not an unprimeable number, because it can be changed into a prime (21944600747) 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, 1380823 + ... + 1396624.

It is an arithmetic number, because the mean of its divisors is an integer number (5486848524).

Almost surely, 2^21944608747 is an apocalyptic number.

21944608747 is a deficient number, since it is larger than the sum of its proper divisors (2785349).

21944608747 is an equidigital number, since it uses as much as digits as its factorization.

21944608747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785348.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 21944608747 in words is "twenty-one billion, nine hundred forty-four million, six hundred eight thousand, seven hundred forty-seven".