21936389761456 has 20 divisors (see below), whose sum is σ = 43872779523904. Its totient is φ = 10614382142400.

The previous prime is 21936389761441. The next prime is 21936389761493. The reversal of 21936389761456 is 65416798363912.

21936389761456 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22113295635 + ... + 22113296626.

Almost surely, 2^{21936389761456} is an apocalyptic number.

It is an amenable number.

21936389761456 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21936389761456 is a wasteful number, since it uses less digits than its factorization.

21936389761456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44226592300 (or 44226592294 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 70.

The spelling of 21936389761456 in words is "twenty-one trillion, nine hundred thirty-six billion, three hundred eighty-nine million, seven hundred sixty-one thousand, four hundred fifty-six".