21552234 has 16 divisors (see below), whose sum is σ = 47023200. Its totient is φ = 6530960.

The previous prime is 21552233. The next prime is 21552239. The reversal of 21552234 is 43225512.

It is not an unprimeable number, because it can be changed into a prime (21552233) 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, 163209 + ... + 163340.

It is an arithmetic number, because the mean of its divisors is an integer number (2938950).

Almost surely, 2^21552234 is an apocalyptic number.

21552234 is an abundant number, since it is smaller than the sum of its proper divisors (25470966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21552234 is a wasteful number, since it uses less digits than its factorization.

21552234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326565.

The product of its digits is 2400, while the sum is 24.

The square root of 21552234 is about 4642.4383679269. The cubic root of 21552234 is about 278.2898913479.

Adding to 21552234 its reverse (43225512), we get a palindrome (64777746).

It can be divided in two parts, 21 and 552234, that added together give a palindrome (552255).

The spelling of 21552234 in words is "twenty-one million, five hundred fifty-two thousand, two hundred thirty-four".