21919728036 has 12 divisors (see below), whose sum is σ = 51146032112. Its totient is φ = 7306576008.

The previous prime is 21919728029. The next prime is 21919728079. The reversal of 21919728036 is 63082791912.

It is a tau number, because it is divible by the number of its divisors (12).

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, 913321990 + ... + 913322013.

Almost surely, 2^21919728036 is an apocalyptic number.

It is an amenable number.

21919728036 is an abundant number, since it is smaller than the sum of its proper divisors (29226304076).

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

21919728036 is a wasteful number, since it uses less digits than its factorization.

21919728036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826644010 (or 1826644008 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The spelling of 21919728036 in words is "twenty-one billion, nine hundred nineteen million, seven hundred twenty-eight thousand, thirty-six".