21173337798 has 16 divisors (see below), whose sum is σ = 42409605936. Its totient is φ = 7047290880.

The previous prime is 21173337797. The next prime is 21173337821. The reversal of 21173337798 is 89773337112.

It is a self number, because there is not a number n which added to its sum of digits gives 21173337798.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21173337797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2617723 + ... + 2625798.

It is an arithmetic number, because the mean of its divisors is an integer number (2650600371).

Almost surely, 2^21173337798 is an apocalyptic number.

21173337798 is an abundant number, since it is smaller than the sum of its proper divisors (21236268138).

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

21173337798 is a wasteful number, since it uses less digits than its factorization.

21173337798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244199.

The product of its digits is 1333584, while the sum is 51.

The spelling of 21173337798 in words is "twenty-one billion, one hundred seventy-three million, three hundred thirty-seven thousand, seven hundred ninety-eight".