21795219 has 24 divisors (see below), whose sum is σ = 32235840. Its totient is φ = 14187312.

The previous prime is 21795217. The next prime is 21795227. The reversal of 21795219 is 91259712.

It is not a de Polignac number, because 21795219 - 2¹ = 21795217 is a prime.

It is a super-2 number, since 2×21795219² = 950063142515922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21795217) 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 23 ways as a sum of consecutive naturals, for example, 121672 + ... + 121850.

It is an arithmetic number, because the mean of its divisors is an integer number (1343160).

Almost surely, 2^21795219 is an apocalyptic number.

21795219 is a deficient number, since it is larger than the sum of its proper divisors (10440621).

21795219 is a wasteful number, since it uses less digits than its factorization.

21795219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 428 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 21795219 is about 4668.5349950493. The cubic root of 21795219 is about 279.3318208720.

The spelling of 21795219 in words is "twenty-one million, seven hundred ninety-five thousand, two hundred nineteen".