21616898 has 16 divisors (see below), whose sum is σ = 33747840. Its totient is φ = 10376496.

The previous prime is 21616891. The next prime is 21616909. The reversal of 21616898 is 89861612.

It is not an unprimeable number, because it can be changed into a prime (21616891) 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, 2813 + ... + 7151.

It is an arithmetic number, because the mean of its divisors is an integer number (2109240).

Almost surely, 2^21616898 is an apocalyptic number.

21616898 is a deficient number, since it is larger than the sum of its proper divisors (12130942).

21616898 is a wasteful number, since it uses less digits than its factorization.

21616898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441.

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

The square root of 21616898 is about 4649.3975953880. The cubic root of 21616898 is about 278.5679347610.

The spelling of 21616898 in words is "twenty-one million, six hundred sixteen thousand, eight hundred ninety-eight".