21245435 has 4 divisors (see below), whose sum is σ = 25494528. Its totient is φ = 16996344.

The previous prime is 21245417. The next prime is 21245459. The reversal of 21245435 is 53454212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21245435 - 2⁸ = 21245179 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2124539 + ... + 2124548.

It is an arithmetic number, because the mean of its divisors is an integer number (6373632).

Almost surely, 2^21245435 is an apocalyptic number.

21245435 is a deficient number, since it is larger than the sum of its proper divisors (4249093).

21245435 is an equidigital number, since it uses as much as digits as its factorization.

21245435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249092.

The product of its digits is 4800, while the sum is 26.

The square root of 21245435 is about 4609.2770582815. The cubic root of 21245435 is about 276.9630772683.

Adding to 21245435 its reverse (53454212), we get a palindrome (74699647).

The spelling of 21245435 in words is "twenty-one million, two hundred forty-five thousand, four hundred thirty-five".