21102195 has 16 divisors (see below), whose sum is σ = 33824160. Its totient is φ = 11234304.

The previous prime is 21102187. The next prime is 21102199. The reversal of 21102195 is 59120112.

It is not a de Polignac number, because 21102195 - 2³ = 21102187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102199) 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, 11587 + ... + 13283.

It is an arithmetic number, because the mean of its divisors is an integer number (2114010).

Almost surely, 2^21102195 is an apocalyptic number.

21102195 is a deficient number, since it is larger than the sum of its proper divisors (12721965).

21102195 is a wasteful number, since it uses less digits than its factorization.

21102195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2534.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 21102195 is about 4593.7125508678. The cubic root of 21102195 is about 276.3392305403.

The spelling of 21102195 in words is "twenty-one million, one hundred two thousand, one hundred ninety-five".