21100698 has 12 divisors (see below), whose sum is σ = 45718218. Its totient is φ = 7033560.

The previous prime is 21100687. The next prime is 21100711. The reversal of 21100698 is 89600112.

It can be written as a sum of positive squares in only one way, i.e., 18948609 + 2152089 = 4353^2 + 1467^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586113 + ... + 586148.

Almost surely, 2^21100698 is an apocalyptic number.

21100698 is an abundant number, since it is smaller than the sum of its proper divisors (24617520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21100698 is a wasteful number, since it uses less digits than its factorization.

21100698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172269 (or 1172266 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 21100698 is about 4593.5496078741. The cubic root of 21100698 is about 276.3326958392.

The spelling of 21100698 in words is "twenty-one million, one hundred thousand, six hundred ninety-eight".