21052235 has 4 divisors (see below), whose sum is σ = 25262688. Its totient is φ = 16841784.

The previous prime is 21052219. The next prime is 21052243. The reversal of 21052235 is 53225012.

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 21052235 - 2⁴ = 21052219 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, 2105219 + ... + 2105228.

It is an arithmetic number, because the mean of its divisors is an integer number (6315672).

Almost surely, 2^21052235 is an apocalyptic number.

21052235 is a deficient number, since it is larger than the sum of its proper divisors (4210453).

21052235 is an equidigital number, since it uses as much as digits as its factorization.

21052235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4210452.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21052235 is about 4588.2714610188. The cubic root of 21052235 is about 276.1209780853.

Adding to 21052235 its reverse (53225012), we get a palindrome (74277247).

The spelling of 21052235 in words is "twenty-one million, fifty-two thousand, two hundred thirty-five".