21133610 has 8 divisors (see below), whose sum is σ = 38040516. Its totient is φ = 8453440.

The previous prime is 21133603. The next prime is 21133631. The reversal of 21133610 is 1633112.

It can be written as a sum of positive squares in 2 ways, for example, as 19193161 + 1940449 = 4381^2 + 1393^2 .

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

It is a Curzon number.

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 in 3 ways as a sum of consecutive naturals, for example, 1056671 + ... + 1056690.

Almost surely, 2^21133610 is an apocalyptic number.

21133610 is a deficient number, since it is larger than the sum of its proper divisors (16906906).

21133610 is a wasteful number, since it uses less digits than its factorization.

21133610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113368.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21133610 is about 4597.1306268149. The cubic root of 21133610 is about 276.4762919939.

Adding to 21133610 its reverse (1633112), we get a palindrome (22766722).

The spelling of 21133610 in words is "twenty-one million, one hundred thirty-three thousand, six hundred ten".