21183133 has 4 divisors (see below), whose sum is σ = 21675808. Its totient is φ = 20690460.

The previous prime is 21183121. The next prime is 21183167. The reversal of 21183133 is 33138112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21183133 - 2¹³ = 21174941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21183103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246273 + ... + 246358.

It is an arithmetic number, because the mean of its divisors is an integer number (5418952).

Almost surely, 2^21183133 is an apocalyptic number.

It is an amenable number.

21183133 is a deficient number, since it is larger than the sum of its proper divisors (492675).

21183133 is an equidigital number, since it uses as much as digits as its factorization.

21183133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492674.

The product of its digits is 432, while the sum is 22.

The square root of 21183133 is about 4602.5137696698. The cubic root of 21183133 is about 276.6920818252.

It can be divided in two parts, 21183 and 133, that added together give a square (21316 = 146²).

The spelling of 21183133 in words is "twenty-one million, one hundred eighty-three thousand, one hundred thirty-three".