21268634 has 8 divisors (see below), whose sum is σ = 32185620. Its totient is φ = 10540096.

The previous prime is 21268631. The next prime is 21268661. The reversal of 21268634 is 43686212.

It can be written as a sum of positive squares in 2 ways, for example, as 13344409 + 7924225 = 3653^2 + 2815^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21268634.

It is not an unprimeable number, because it can be changed into a prime (21268631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46829 + ... + 47280.

Almost surely, 2^21268634 is an apocalyptic number.

21268634 is a deficient number, since it is larger than the sum of its proper divisors (10916986).

21268634 is a wasteful number, since it uses less digits than its factorization.

21268634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94224.

The product of its digits is 13824, while the sum is 32.

The square root of 21268634 is about 4611.7929268344. The cubic root of 21268634 is about 277.0638507467.

The spelling of 21268634 in words is "twenty-one million, two hundred sixty-eight thousand, six hundred thirty-four".