21194133 has 16 divisors (see below), whose sum is σ = 29223936. Its totient is φ = 13654640.

The previous prime is 21194123. The next prime is 21194149. The reversal of 21194133 is 33149112.

It is a cyclic number.

It is not a de Polignac number, because 21194133 - 2⁹ = 21193621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10798 + ... + 12608.

It is an arithmetic number, because the mean of its divisors is an integer number (1826496).

Almost surely, 2^21194133 is an apocalyptic number.

It is an amenable number.

21194133 is a deficient number, since it is larger than the sum of its proper divisors (8029803).

21194133 is a wasteful number, since it uses less digits than its factorization.

21194133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944.

The product of its digits is 648, while the sum is 24.

The square root of 21194133 is about 4603.7086137157. The cubic root of 21194133 is about 276.7399671910.

The spelling of 21194133 in words is "twenty-one million, one hundred ninety-four thousand, one hundred thirty-three".