21232245 has 16 divisors (see below), whose sum is σ = 34094592. Its totient is φ = 11282880.

The previous prime is 21232229. The next prime is 21232247. The reversal of 21232245 is 54223212.

It is not a de Polignac number, because 21232245 - 2⁴ = 21232229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232247) 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, 1980 + ... + 6810.

It is an arithmetic number, because the mean of its divisors is an integer number (2130912).

Almost surely, 2^21232245 is an apocalyptic number.

It is an amenable number.

21232245 is a deficient number, since it is larger than the sum of its proper divisors (12862347).

21232245 is a wasteful number, since it uses less digits than its factorization.

21232245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132.

The product of its digits is 960, while the sum is 21.

The square root of 21232245 is about 4607.8460260734. The cubic root of 21232245 is about 276.9057488861.

Adding to 21232245 its reverse (54223212), we get a palindrome (75455457).

The spelling of 21232245 in words is "twenty-one million, two hundred thirty-two thousand, two hundred forty-five".