21098130 has 32 divisors (see below), whose sum is σ = 52838784. Its totient is φ = 5381376.

The previous prime is 21098111. The next prime is 21098141. The reversal of 21098130 is 3189012.

It is a self number, because there is not a number n which added to its sum of digits gives 21098130.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14599 + ... + 15978.

It is an arithmetic number, because the mean of its divisors is an integer number (1651212).

Almost surely, 2^21098130 is an apocalyptic number.

21098130 is an abundant number, since it is smaller than the sum of its proper divisors (31740654).

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

21098130 is a wasteful number, since it uses less digits than its factorization.

21098130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30610.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21098130 is about 4593.2700769713. The cubic root of 21098130 is about 276.3214852913.

The spelling of 21098130 in words is "twenty-one million, ninety-eight thousand, one hundred thirty".