21373735328 has 48 divisors (see below), whose sum is σ = 45918109440. Its totient is φ = 9712550400.

The previous prime is 21373735301. The next prime is 21373735337. The reversal of 21373735328 is 82353737312.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1694228 + ... + 1706796.

It is an arithmetic number, because the mean of its divisors is an integer number (956627280).

Almost surely, 2^21373735328 is an apocalyptic number.

It is an amenable number.

21373735328 is an abundant number, since it is smaller than the sum of its proper divisors (24544374112).

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

21373735328 is a wasteful number, since it uses less digits than its factorization.

21373735328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17421 (or 17413 counting only the distinct ones).

The product of its digits is 635040, while the sum is 44.

The spelling of 21373735328 in words is "twenty-one billion, three hundred seventy-three million, seven hundred thirty-five thousand, three hundred twenty-eight".