21032245 has 16 divisors (see below), whose sum is σ = 27320832. Its totient is φ = 15451200.

The previous prime is 21032237. The next prime is 21032267. The reversal of 21032245 is 54223012.

It is not a de Polignac number, because 21032245 - 2³ = 21032237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13770 + ... + 15220.

It is an arithmetic number, because the mean of its divisors is an integer number (1707552).

Almost surely, 2^21032245 is an apocalyptic number.

It is an amenable number.

21032245 is a deficient number, since it is larger than the sum of its proper divisors (6288587).

21032245 is a wasteful number, since it uses less digits than its factorization.

21032245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21032245 is about 4586.0925633921. The cubic root of 21032245 is about 276.0335541716.

Adding to 21032245 its reverse (54223012), we get a palindrome (75255257).

The spelling of 21032245 in words is "twenty-one million, thirty-two thousand, two hundred forty-five".