21142333 has 8 divisors (see below), whose sum is σ = 21511800. Its totient is φ = 20775168.

The previous prime is 21142291. The next prime is 21142343. The reversal of 21142333 is 33324112.

It can be written as a sum of positive squares in 4 ways, for example, as 3392964 + 17749369 = 1842^2 + 4213^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21142333 - 2⁹ = 21141821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21142333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142343) 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 7 ways as a sum of consecutive naturals, for example, 36873 + ... + 37441.

It is an arithmetic number, because the mean of its divisors is an integer number (2688975).

Almost surely, 2^21142333 is an apocalyptic number.

It is an amenable number.

21142333 is a deficient number, since it is larger than the sum of its proper divisors (369467).

21142333 is an equidigital number, since it uses as much as digits as its factorization.

21142333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151.

The product of its digits is 432, while the sum is 19.

The square root of 21142333 is about 4598.0792729139. The cubic root of 21142333 is about 276.5143257382.

Adding to 21142333 its reverse (33324112), we get a palindrome (54466445).

The spelling of 21142333 in words is "twenty-one million, one hundred forty-two thousand, three hundred thirty-three".