21041235 has 16 divisors (see below), whose sum is σ = 37406880. Its totient is φ = 11221920.

The previous prime is 21041221. The next prime is 21041239. The reversal of 21041235 is 53214012.

It is not a de Polignac number, because 21041235 - 2⁵ = 21041203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21041239) 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, 77796 + ... + 78065.

It is an arithmetic number, because the mean of its divisors is an integer number (2337930).

Almost surely, 2^21041235 is an apocalyptic number.

21041235 is a deficient number, since it is larger than the sum of its proper divisors (16365645).

21041235 is a wasteful number, since it uses less digits than its factorization.

21041235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155875 (or 155869 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21041235 is about 4587.0725958938. The cubic root of 21041235 is about 276.0728777304.

Adding to 21041235 its reverse (53214012), we get a palindrome (74255247).

The spelling of 21041235 in words is "twenty-one million, forty-one thousand, two hundred thirty-five".