21732898 has 16 divisors (see below), whose sum is σ = 35719200. Its totient is φ = 9835200.

The previous prime is 21732889. The next prime is 21732899. The reversal of 21732898 is 89823712.

It is a self number, because there is not a number n which added to its sum of digits gives 21732898.

It is not an unprimeable number, because it can be changed into a prime (21732899) 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, 3253 + ... + 7351.

It is an arithmetic number, because the mean of its divisors is an integer number (2232450).

Almost surely, 2^21732898 is an apocalyptic number.

21732898 is a deficient number, since it is larger than the sum of its proper divisors (13986302).

21732898 is a wasteful number, since it uses less digits than its factorization.

21732898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4353.

The product of its digits is 48384, while the sum is 40.

The square root of 21732898 is about 4661.8556391205. The cubic root of 21732898 is about 279.0653273026.

The spelling of 21732898 in words is "twenty-one million, seven hundred thirty-two thousand, eight hundred ninety-eight".