21317194 has 8 divisors (see below), whose sum is σ = 32021280. Its totient is φ = 10643436.

The previous prime is 21317147. The next prime is 21317209. The reversal of 21317194 is 49171312.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5734 + ... + 8689.

It is an arithmetic number, because the mean of its divisors is an integer number (4002660).

Almost surely, 2^21317194 is an apocalyptic number.

21317194 is a deficient number, since it is larger than the sum of its proper divisors (10704086).

21317194 is a wasteful number, since it uses less digits than its factorization.

21317194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15164.

The product of its digits is 1512, while the sum is 28.

The square root of 21317194 is about 4617.0546888682. The cubic root of 21317194 is about 277.2745521660.

The spelling of 21317194 in words is "twenty-one million, three hundred seventeen thousand, one hundred ninety-four".