21944444135 has 16 divisors (see below), whose sum is σ = 27887102496. Its totient is φ = 16520060928.

The previous prime is 21944444107. The next prime is 21944444153. The reversal of 21944444135 is 53144444912.

It is a cyclic number.

It is not a de Polignac number, because 21944444135 - 2¹² = 21944440039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21944444092 and 21944444101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574544 + ... + 611546.

It is an arithmetic number, because the mean of its divisors is an integer number (1742943906).

Almost surely, 2^21944444135 is an apocalyptic number.

21944444135 is a deficient number, since it is larger than the sum of its proper divisors (5942658361).

21944444135 is a wasteful number, since it uses less digits than its factorization.

21944444135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44002.

The product of its digits is 276480, while the sum is 41.

The spelling of 21944444135 in words is "twenty-one billion, nine hundred forty-four million, four hundred forty-four thousand, one hundred thirty-five".