21328195 has 16 divisors (see below), whose sum is σ = 30260160. Its totient is φ = 14120064.

The previous prime is 21328193. The next prime is 21328201. The reversal of 21328195 is 59182312.

It is not a de Polignac number, because 21328195 - 2¹ = 21328193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21328193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9492 + ... + 11521.

It is an arithmetic number, because the mean of its divisors is an integer number (1891260).

Almost surely, 2^21328195 is an apocalyptic number.

21328195 is a deficient number, since it is larger than the sum of its proper divisors (8931965).

21328195 is a wasteful number, since it uses less digits than its factorization.

21328195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21054.

The product of its digits is 4320, while the sum is 31.

The square root of 21328195 is about 4618.2458791190. The cubic root of 21328195 is about 277.3222409439.

The spelling of 21328195 in words is "twenty-one million, three hundred twenty-eight thousand, one hundred ninety-five".