21831634 has 16 divisors (see below), whose sum is σ = 35886240. Its totient is φ = 9878560.

The previous prime is 21831631. The next prime is 21831637. The reversal of 21831634 is 43613812.

It is an interprime number because it is at equal distance from previous prime (21831631) and next prime (21831637).

It is not an unprimeable number, because it can be changed into a prime (21831631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2997 + ... + 7255.

It is an arithmetic number, because the mean of its divisors is an integer number (2242890).

Almost surely, 2^21831634 is an apocalyptic number.

21831634 is a deficient number, since it is larger than the sum of its proper divisors (14054606).

21831634 is a wasteful number, since it uses less digits than its factorization.

21831634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505.

The product of its digits is 3456, while the sum is 28.

The square root of 21831634 is about 4672.4334131157. The cubic root of 21831634 is about 279.4873015844.

The spelling of 21831634 in words is "twenty-one million, eight hundred thirty-one thousand, six hundred thirty-four".