21350333 has 4 divisors (see below), whose sum is σ = 21539388. Its totient is φ = 21161280.

The previous prime is 21350323. The next prime is 21350341. The reversal of 21350333 is 33305312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8655364 + 12694969 = 2942^2 + 3563^2 .

It is a cyclic number.

It is not a de Polignac number, because 21350333 - 2¹⁰ = 21349309 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 (21350323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94358 + ... + 94583.

It is an arithmetic number, because the mean of its divisors is an integer number (5384847).

Almost surely, 2^21350333 is an apocalyptic number.

It is an amenable number.

21350333 is a deficient number, since it is larger than the sum of its proper divisors (189055).

21350333 is a wasteful number, since it uses less digits than its factorization.

21350333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189054.

The product of its (nonzero) digits is 810, while the sum is 20.

The square root of 21350333 is about 4620.6420549530. The cubic root of 21350333 is about 277.4181583721.

Adding to 21350333 its reverse (33305312), we get a palindrome (54655645).

The spelling of 21350333 in words is "twenty-one million, three hundred fifty thousand, three hundred thirty-three".