21169634 has 8 divisors (see below), whose sum is σ = 31782828. Its totient is φ = 10575360.

The previous prime is 21169633. The next prime is 21169639. The reversal of 21169634 is 43696112.

It can be written as a sum of positive squares in 2 ways, for example, as 19333609 + 1836025 = 4397^2 + 1355^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21169634.

It is not an unprimeable number, because it can be changed into a prime (21169633) 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, 1487 + ... + 6674.

Almost surely, 2^21169634 is an apocalyptic number.

21169634 is a deficient number, since it is larger than the sum of its proper divisors (10613194).

21169634 is a wasteful number, since it uses less digits than its factorization.

21169634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9460.

The product of its digits is 7776, while the sum is 32.

The square root of 21169634 is about 4601.0470547474. The cubic root of 21169634 is about 276.6332951152.

The spelling of 21169634 in words is "twenty-one million, one hundred sixty-nine thousand, six hundred thirty-four".