21417194 has 8 divisors (see below), whose sum is σ = 32732100. Its totient is φ = 10506496.

The previous prime is 21417181. The next prime is 21417203. The reversal of 21417194 is 49171412.

It can be written as a sum of positive squares in 2 ways, for example, as 21390625 + 26569 = 4625^2 + 163^2 .

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

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, 100919 + ... + 101130.

Almost surely, 2^21417194 is an apocalyptic number.

21417194 is a deficient number, since it is larger than the sum of its proper divisors (11314906).

21417194 is a wasteful number, since it uses less digits than its factorization.

21417194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202104.

The product of its digits is 2016, while the sum is 29.

The square root of 21417194 is about 4627.8714329592. The cubic root of 21417194 is about 277.7074454588.

The spelling of 21417194 in words is "twenty-one million, four hundred seventeen thousand, one hundred ninety-four".