21973195 has 4 divisors (see below), whose sum is σ = 26367840. Its totient is φ = 17578552.

The previous prime is 21973181. The next prime is 21973207. The reversal of 21973195 is 59137912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21973195 - 2¹⁵ = 21940427 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 3 ways as a sum of consecutive naturals, for example, 2197315 + ... + 2197324.

It is an arithmetic number, because the mean of its divisors is an integer number (6591960).

Almost surely, 2^21973195 is an apocalyptic number.

21973195 is a deficient number, since it is larger than the sum of its proper divisors (4394645).

21973195 is an equidigital number, since it uses as much as digits as its factorization.

21973195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4394644.

The product of its digits is 17010, while the sum is 37.

The square root of 21973195 is about 4687.5574663144. The cubic root of 21973195 is about 280.0900858090.

The spelling of 21973195 in words is "twenty-one million, nine hundred seventy-three thousand, one hundred ninety-five".