21944444137 has 8 divisors (see below), whose sum is σ = 27359307072. Its totient is φ = 17099566800.

The previous prime is 21944444107. The next prime is 21944444153. The reversal of 21944444137 is 73144444912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21944444137 - 2²³ = 21936055529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21944444093 and 21944444102.

It is not an unprimeable number, because it can be changed into a prime (21944444107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142496314 + ... + 142496467.

It is an arithmetic number, because the mean of its divisors is an integer number (3419913384).

Almost surely, 2^21944444137 is an apocalyptic number.

It is an amenable number.

21944444137 is a deficient number, since it is larger than the sum of its proper divisors (5414862935).

21944444137 is a wasteful number, since it uses less digits than its factorization.

21944444137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284992799.

The product of its digits is 387072, while the sum is 43.

The spelling of 21944444137 in words is "twenty-one billion, nine hundred forty-four million, four hundred forty-four thousand, one hundred thirty-seven".