21335634 has 12 divisors (see below), whose sum is σ = 46227246. Its totient is φ = 7111872.

The previous prime is 21335623. The next prime is 21335641. The reversal of 21335634 is 43653312.

It is a happy number.

21335634 is a `hidden beast` number, since 21 + 3 + 3 + 5 + 634 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18948609 + 2387025 = 4353^2 + 1545^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21335598 and 21335607.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 592639 + ... + 592674.

Almost surely, 2^21335634 is an apocalyptic number.

21335634 is an abundant number, since it is smaller than the sum of its proper divisors (24891612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21335634 is a wasteful number, since it uses less digits than its factorization.

21335634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185321 (or 1185318 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 21335634 is about 4619.0512012750. The cubic root of 21335634 is about 277.3544793392.

Adding to 21335634 its reverse (43653312), we get a palindrome (64988946).

The spelling of 21335634 in words is "twenty-one million, three hundred thirty-five thousand, six hundred thirty-four".