21634910 has 16 divisors (see below), whose sum is σ = 42483312. Its totient is φ = 7867200.

The previous prime is 21634909. The next prime is 21634913. The reversal of 21634910 is 1943612.

It is a self number, because there is not a number n which added to its sum of digits gives 21634910.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634913) 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, 98231 + ... + 98450.

It is an arithmetic number, because the mean of its divisors is an integer number (2655207).

Almost surely, 2^21634910 is an apocalyptic number.

21634910 is a deficient number, since it is larger than the sum of its proper divisors (20848402).

21634910 is a wasteful number, since it uses less digits than its factorization.

21634910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196699.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21634910 is about 4651.3342171897. The cubic root of 21634910 is about 278.6452843215.

The spelling of 21634910 in words is "twenty-one million, six hundred thirty-four thousand, nine hundred ten".