21898432 has 28 divisors (see below), whose sum is σ = 43653456. Its totient is φ = 10899200.

The previous prime is 21898417. The next prime is 21898433. The reversal of 21898432 is 23489812.

It is a junction number, because it is equal to n+sod(n) for n = 21898391 and 21898400.

It is not an unprimeable number, because it can be changed into a prime (21898433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16182 + ... + 17482.

It is an arithmetic number, because the mean of its divisors is an integer number (1559052).

Almost surely, 2^21898432 is an apocalyptic number.

It is an amenable number.

21898432 is a deficient number, since it is larger than the sum of its proper divisors (21755024).

21898432 is a wasteful number, since it uses less digits than its factorization.

21898432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576 (or 1566 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 21898432 is about 4679.5760491737. The cubic root of 21898432 is about 279.7720593879.

The spelling of 21898432 in words is "twenty-one million, eight hundred ninety-eight thousand, four hundred thirty-two".