21226195 has 4 divisors (see below), whose sum is σ = 25471440. Its totient is φ = 16980952.

The previous prime is 21226193. The next prime is 21226199. The reversal of 21226195 is 59162212.

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 21226195 - 2¹ = 21226193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21226193) by changing a digit.

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, 2122615 + ... + 2122624.

It is an arithmetic number, because the mean of its divisors is an integer number (6367860).

Almost surely, 2^21226195 is an apocalyptic number.

21226195 is a deficient number, since it is larger than the sum of its proper divisors (4245245).

21226195 is an equidigital number, since it uses as much as digits as its factorization.

21226195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4245244.

The product of its digits is 2160, while the sum is 28.

The square root of 21226195 is about 4607.1894903509. The cubic root of 21226195 is about 276.8794455139.

The spelling of 21226195 in words is "twenty-one million, two hundred twenty-six thousand, one hundred ninety-five".