21898544 has 10 divisors (see below), whose sum is σ = 42428460. Its totient is φ = 10949264.

The previous prime is 21898537. The next prime is 21898559. The reversal of 21898544 is 44589812.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684314 + ... + 684345.

It is an arithmetic number, because the mean of its divisors is an integer number (4242846).

Almost surely, 2^21898544 is an apocalyptic number.

It is an amenable number.

21898544 is a deficient number, since it is larger than the sum of its proper divisors (20529916).

21898544 is a wasteful number, since it uses less digits than its factorization.

21898544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368667 (or 1368661 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 21898544 is about 4679.5880160544. The cubic root of 21898544 is about 279.7725363538.

The spelling of 21898544 in words is "twenty-one million, eight hundred ninety-eight thousand, five hundred forty-four".