21133594 has 4 divisors (see below), whose sum is σ = 31700394. Its totient is φ = 10566796.

The previous prime is 21133589. The next prime is 21133603. The reversal of 21133594 is 49533112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21040569 + 93025 = 4587^2 + 305^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5283397 + ... + 5283400.

Almost surely, 2^21133594 is an apocalyptic number.

21133594 is a deficient number, since it is larger than the sum of its proper divisors (10566800).

21133594 is a wasteful number, since it uses less digits than its factorization.

21133594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10566799.

The product of its digits is 3240, while the sum is 28.

The square root of 21133594 is about 4597.1288865987. The cubic root of 21133594 is about 276.4762222216.

The spelling of 21133594 in words is "twenty-one million, one hundred thirty-three thousand, five hundred ninety-four".