21898616 has 32 divisors (see below), whose sum is σ = 42336000. Its totient is φ = 10613856.

The previous prime is 21898607. The next prime is 21898619. The reversal of 21898616 is 61689812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21898619) 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, 52055 + ... + 52473.

It is an arithmetic number, because the mean of its divisors is an integer number (1323000).

Almost surely, 2^21898616 is an apocalyptic number.

It is an amenable number.

21898616 is a deficient number, since it is larger than the sum of its proper divisors (20437384).

21898616 is a wasteful number, since it uses less digits than its factorization.

21898616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 607 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 21898616 is about 4679.5957090330. The cubic root of 21898616 is about 279.7728429739.

The spelling of 21898616 in words is "twenty-one million, eight hundred ninety-eight thousand, six hundred sixteen".