21336055388 has 12 divisors (see below), whose sum is σ = 37339133832. Its totient is φ = 10667731440.

The previous prime is 21336055361. The next prime is 21336055393. The reversal of 21336055388 is 88355063312.

It is a congruent 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, 203843 + ... + 290213.

It is an arithmetic number, because the mean of its divisors is an integer number (3111594486).

Almost surely, 2^21336055388 is an apocalyptic number.

It is an amenable number.

21336055388 is a deficient number, since it is larger than the sum of its proper divisors (16003078444).

21336055388 is a wasteful number, since it uses less digits than its factorization.

21336055388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148132 (or 148130 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 21336055388 in words is "twenty-one billion, three hundred thirty-six million, fifty-five thousand, three hundred eighty-eight".