21365235 has 16 divisors (see below), whose sum is σ = 37982880. Its totient is φ = 11394720.

The previous prime is 21365233. The next prime is 21365269. The reversal of 21365235 is 53256312.

21365235 is a `hidden beast` number, since 2 + 1 + 3 + 652 + 3 + 5 = 666.

It is not a de Polignac number, because 21365235 - 2¹ = 21365233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21365199 and 21365208.

It is not an unprimeable number, because it can be changed into a prime (21365233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78996 + ... + 79265.

It is an arithmetic number, because the mean of its divisors is an integer number (2373930).

Almost surely, 2^21365235 is an apocalyptic number.

21365235 is a deficient number, since it is larger than the sum of its proper divisors (16617645).

21365235 is a wasteful number, since it uses less digits than its factorization.

21365235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158275 (or 158269 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 21365235 is about 4622.2543201343. The cubic root of 21365235 is about 277.4826870134.

The spelling of 21365235 in words is "twenty-one million, three hundred sixty-five thousand, two hundred thirty-five".