21632234 has 16 divisors (see below), whose sum is σ = 36072960. Its totient is φ = 9661680.

The previous prime is 21632201. The next prime is 21632257. The reversal of 21632234 is 43223612.

It is a Curzon number.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12614 + ... + 14225.

It is an arithmetic number, because the mean of its divisors is an integer number (2254560).

Almost surely, 2^21632234 is an apocalyptic number.

21632234 is a deficient number, since it is larger than the sum of its proper divisors (14440726).

21632234 is a wasteful number, since it uses less digits than its factorization.

21632234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26885.

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

The square root of 21632234 is about 4651.0465488963. The cubic root of 21632234 is about 278.6337953972.

Adding to 21632234 its reverse (43223612), we get a palindrome (64855846).

The spelling of 21632234 in words is "twenty-one million, six hundred thirty-two thousand, two hundred thirty-four".