21136935 has 16 divisors (see below), whose sum is σ = 34644960. Its totient is φ = 10997760.

The previous prime is 21136919. The next prime is 21136937. The reversal of 21136935 is 53963112.

It is not a de Polignac number, because 21136935 - 2⁴ = 21136919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136937) 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, 16570 + ... + 17799.

It is an arithmetic number, because the mean of its divisors is an integer number (2165310).

Almost surely, 2^21136935 is an apocalyptic number.

21136935 is a deficient number, since it is larger than the sum of its proper divisors (13508025).

21136935 is a wasteful number, since it uses less digits than its factorization.

21136935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34418.

The product of its digits is 4860, while the sum is 30.

The square root of 21136935 is about 4597.4922512170. The cubic root of 21136935 is about 276.4907907862.

The spelling of 21136935 in words is "twenty-one million, one hundred thirty-six thousand, nine hundred thirty-five".