21326234 has 16 divisors (see below), whose sum is σ = 32695488. Its totient is φ = 10430112.

The previous prime is 21326231. The next prime is 21326309. The reversal of 21326234 is 43262312.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (21326231) 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, 21902 + ... + 22854.

It is an arithmetic number, because the mean of its divisors is an integer number (2043468).

Almost surely, 2^21326234 is an apocalyptic number.

21326234 is a deficient number, since it is larger than the sum of its proper divisors (11369254).

21326234 is a wasteful number, since it uses less digits than its factorization.

21326234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189.

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

The square root of 21326234 is about 4618.0335641916. The cubic root of 21326234 is about 277.3137413094.

Adding to 21326234 its reverse (43262312), we get a palindrome (64588546).

The spelling of 21326234 in words is "twenty-one million, three hundred twenty-six thousand, two hundred thirty-four".