21898894 has 16 divisors (see below), whose sum is σ = 33994800. Its totient is φ = 10571904.

The previous prime is 21898889. The next prime is 21898901. The reversal of 21898894 is 49889812.

It is a congruent number.

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, 9222 + ... + 11350.

It is an arithmetic number, because the mean of its divisors is an integer number (2124675).

Almost surely, 2^21898894 is an apocalyptic number.

21898894 is a deficient number, since it is larger than the sum of its proper divisors (12095906).

21898894 is a wasteful number, since it uses less digits than its factorization.

21898894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307.

The product of its digits is 331776, while the sum is 49.

The square root of 21898894 is about 4679.6254123594. The cubic root of 21898894 is about 279.7740268618.

The spelling of 21898894 in words is "twenty-one million, eight hundred ninety-eight thousand, eight hundred ninety-four".