21233442 has 32 divisors (see below), whose sum is σ = 45489600. Its totient is φ = 6583808.

The previous prime is 21233441. The next prime is 21233453. The reversal of 21233442 is 24433212.

It is not an unprimeable number, because it can be changed into a prime (21233441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7909 + ... + 10247.

It is an arithmetic number, because the mean of its divisors is an integer number (1421550).

Almost surely, 2^21233442 is an apocalyptic number.

21233442 is an abundant number, since it is smaller than the sum of its proper divisors (24256158).

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

21233442 is a wasteful number, since it uses less digits than its factorization.

21233442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450.

The product of its digits is 1152, while the sum is 21.

The square root of 21233442 is about 4607.9759113954. The cubic root of 21233442 is about 276.9109524487.

Adding to 21233442 its reverse (24433212), we get a palindrome (45666654).

It can be divided in two parts, 2123 and 3442, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 21233442 in words is "twenty-one million, two hundred thirty-three thousand, four hundred forty-two".