21363233 has 4 divisors (see below), whose sum is σ = 21381168. Its totient is φ = 21345300.

The previous prime is 21363193. The next prime is 21363253. The reversal of 21363233 is 33236312.

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 21363233 - 2²⁴ = 4586017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21363199 and 21363208.

It is not an unprimeable number, because it can be changed into a prime (21363253) 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, 7043 + ... + 9608.

It is an arithmetic number, because the mean of its divisors is an integer number (5345292).

Almost surely, 2^21363233 is an apocalyptic number.

It is an amenable number.

21363233 is a deficient number, since it is larger than the sum of its proper divisors (17935).

21363233 is a wasteful number, since it uses less digits than its factorization.

21363233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17934.

The product of its digits is 1944, while the sum is 23.

The square root of 21363233 is about 4622.0377540648. The cubic root of 21363233 is about 277.4740196980.

Adding to 21363233 its reverse (33236312), we get a palindrome (54599545).

The spelling of 21363233 in words is "twenty-one million, three hundred sixty-three thousand, two hundred thirty-three".