21363298728 has 64 divisors (see below), whose sum is σ = 53659300800. Its totient is φ = 7087703040.

The previous prime is 21363298711. The next prime is 21363298741. The reversal of 21363298728 is 82789236312.

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, 5630400 + ... + 5634192.

It is an arithmetic number, because the mean of its divisors is an integer number (838426575).

Almost surely, 2^21363298728 is an apocalyptic number.

It is an amenable number.

21363298728 is an abundant number, since it is smaller than the sum of its proper divisors (32296002072).

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

21363298728 is a wasteful number, since it uses less digits than its factorization.

21363298728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4842 (or 4838 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The spelling of 21363298728 in words is "twenty-one billion, three hundred sixty-three million, two hundred ninety-eight thousand, seven hundred twenty-eight".