21112242 has 16 divisors (see below), whose sum is σ = 42599520. Its totient is φ = 6974912.

The previous prime is 21112241. The next prime is 21112279. The reversal of 21112242 is 24221112.

It is not an unprimeable number, because it can be changed into a prime (21112241) 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, 14892 + ... + 16247.

It is an arithmetic number, because the mean of its divisors is an integer number (2662470).

Almost surely, 2^21112242 is an apocalyptic number.

21112242 is an abundant number, since it is smaller than the sum of its proper divisors (21487278).

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

21112242 is a wasteful number, since it uses less digits than its factorization.

21112242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31257.

The product of its digits is 64, while the sum is 15.

The square root of 21112242 is about 4594.8059806699. The cubic root of 21112242 is about 276.3830796871.

Adding to 21112242 its reverse (24221112), we get a palindrome (45333354).

The spelling of 21112242 in words is "twenty-one million, one hundred twelve thousand, two hundred forty-two".