21232634 has 16 divisors (see below), whose sum is σ = 33694272. Its totient is φ = 10014048.

The previous prime is 21232571. The next prime is 21232639. The reversal of 21232634 is 43623212.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (21232639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197 + ... + 6519.

It is an arithmetic number, because the mean of its divisors is an integer number (2105892).

Almost surely, 2^21232634 is an apocalyptic number.

21232634 is a deficient number, since it is larger than the sum of its proper divisors (12461638).

21232634 is a wasteful number, since it uses less digits than its factorization.

21232634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6421.

The product of its digits is 1728, while the sum is 23.

The square root of 21232634 is about 4607.8882364919. Note that the first 3 decimals coincide. The cubic root of 21232634 is about 276.9074399567.

Adding to 21232634 its reverse (43623212), we get a palindrome (64855846).

The spelling of 21232634 in words is "twenty-one million, two hundred thirty-two thousand, six hundred thirty-four".