21680098 has 32 divisors (see below), whose sum is σ = 37158912. Its totient is φ = 9397200.

The previous prime is 21680093. The next prime is 21680101. The reversal of 21680098 is 89008612.

It is not an unprimeable number, because it can be changed into a prime (21680093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56415 + ... + 56797.

It is an arithmetic number, because the mean of its divisors is an integer number (1161216).

Almost surely, 2^21680098 is an apocalyptic number.

21680098 is a deficient number, since it is larger than the sum of its proper divisors (15478814).

21680098 is a wasteful number, since it uses less digits than its factorization.

21680098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 21680098 is about 4656.1892143683. The cubic root of 21680098 is about 278.8391479561.

The spelling of 21680098 in words is "twenty-one million, six hundred eighty thousand, ninety-eight".