21194168 has 16 divisors (see below), whose sum is σ = 39788160. Its totient is φ = 10584000.

The previous prime is 21194149. The next prime is 21194197. The reversal of 21194168 is 86149112.

It is a congruent number.

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, 10868 + ... + 12668.

It is an arithmetic number, because the mean of its divisors is an integer number (2486760).

Almost surely, 2^21194168 is an apocalyptic number.

It is an amenable number.

21194168 is a deficient number, since it is larger than the sum of its proper divisors (18593992).

21194168 is a wasteful number, since it uses less digits than its factorization.

21194168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278 (or 3274 counting only the distinct ones).

The product of its digits is 3456, while the sum is 32.

The square root of 21194168 is about 4603.7124149973. The cubic root of 21194168 is about 276.7401195271.

The spelling of 21194168 in words is "twenty-one million, one hundred ninety-four thousand, one hundred sixty-eight".