21130195 has 16 divisors (see below), whose sum is σ = 25866720. Its totient is φ = 16568064.

The previous prime is 21130111. The next prime is 21130231. The reversal of 21130195 is 59103112.

It is a cyclic number.

It is not a de Polignac number, because 21130195 - 2²¹ = 19033043 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74524 + ... + 74806.

It is an arithmetic number, because the mean of its divisors is an integer number (1616670).

Almost surely, 2^21130195 is an apocalyptic number.

21130195 is a deficient number, since it is larger than the sum of its proper divisors (4736525).

21130195 is a wasteful number, since it uses less digits than its factorization.

21130195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 21130195 is about 4596.7591844690. The cubic root of 21130195 is about 276.4613991700.

The spelling of 21130195 in words is "twenty-one million, one hundred thirty thousand, one hundred ninety-five".