21336045 has 16 divisors (see below), whose sum is σ = 34200960. Its totient is φ = 11358144.

The previous prime is 21336017. The next prime is 21336047. The reversal of 21336045 is 54063312.

It is a happy number.

It is not a de Polignac number, because 21336045 - 2⁶ = 21335981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21336047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10416 + ... + 12294.

It is an arithmetic number, because the mean of its divisors is an integer number (2137560).

Almost surely, 2^21336045 is an apocalyptic number.

It is an amenable number.

21336045 is a deficient number, since it is larger than the sum of its proper divisors (12864915).

21336045 is a wasteful number, since it uses less digits than its factorization.

21336045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 21336045 is about 4619.0956907170. The cubic root of 21336045 is about 277.3562602715.

Adding to 21336045 its reverse (54063312), we get a palindrome (75399357).

The spelling of 21336045 in words is "twenty-one million, three hundred thirty-six thousand, forty-five".