21232442 has 16 divisors (see below), whose sum is σ = 39707712. Its totient is φ = 8272320.

The previous prime is 21232441. The next prime is 21232447. The reversal of 21232442 is 24423212.

It is not an unprimeable number, because it can be changed into a prime (21232441) 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, 68783 + ... + 69090.

It is an arithmetic number, because the mean of its divisors is an integer number (2481732).

Almost surely, 2^21232442 is an apocalyptic number.

21232442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21232442 is a deficient number, since it is larger than the sum of its proper divisors (18475270).

21232442 is a wasteful number, since it uses less digits than its factorization.

21232442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137893.

The product of its digits is 768, while the sum is 20.

The square root of 21232442 is about 4607.8674026061. The cubic root of 21232442 is about 276.9066052920.

Adding to 21232442 its reverse (24423212), we get a palindrome (45655654).

The spelling of 21232442 in words is "twenty-one million, two hundred thirty-two thousand, four hundred forty-two".