21689098 has 8 divisors (see below), whose sum is σ = 32559300. Its totient is φ = 10836000.

The previous prime is 21689081. The next prime is 21689111. The reversal of 21689098 is 89098612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21372129 + 316969 = 4623^2 + 563^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403 + ... + 6598.

Almost surely, 2^21689098 is an apocalyptic number.

21689098 is a deficient number, since it is larger than the sum of its proper divisors (10870202).

21689098 is a wasteful number, since it uses less digits than its factorization.

21689098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8552.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 21689098 is about 4657.1555696584. The cubic root of 21689098 is about 278.8777271967.

The spelling of 21689098 in words is "twenty-one million, six hundred eighty-nine thousand, ninety-eight".