21944444136 has 64 divisors (see below), whose sum is σ = 57789158400. Its totient is φ = 6924950208.

The previous prime is 21944444107. The next prime is 21944444153. The reversal of 21944444136 is 63144444912.

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, 661891 + ... + 694253.

It is an arithmetic number, because the mean of its divisors is an integer number (902955600).

Almost surely, 2^21944444136 is an apocalyptic number.

It is an amenable number.

21944444136 is an abundant number, since it is smaller than the sum of its proper divisors (35844714264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21944444136 is a wasteful number, since it uses less digits than its factorization.

21944444136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33878 (or 33874 counting only the distinct ones).

The product of its digits is 331776, while the sum is 42.

The spelling of 21944444136 in words is "twenty-one billion, nine hundred forty-four million, four hundred forty-four thousand, one hundred thirty-six".