21091195 has 8 divisors (see below), whose sum is σ = 25570944. Its totient is φ = 16698624.

The previous prime is 21091193. The next prime is 21091201. The reversal of 21091195 is 59119012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21091195 - 2¹ = 21091193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21091193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21259 + ... + 22228.

It is an arithmetic number, because the mean of its divisors is an integer number (3196368).

Almost surely, 2^21091195 is an apocalyptic number.

21091195 is a deficient number, since it is larger than the sum of its proper divisors (4479749).

21091195 is an equidigital number, since it uses as much as digits as its factorization.

21091195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43589.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 21091195 is about 4592.5151061265. The cubic root of 21091195 is about 276.2912061544.

The spelling of 21091195 in words is "twenty-one million, ninety-one thousand, one hundred ninety-five".