21112342 has 4 divisors (see below), whose sum is σ = 31668516. Its totient is φ = 10556170.

The previous prime is 21112339. The next prime is 21112349. The reversal of 21112342 is 24321112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278084 + ... + 5278087.

It is an arithmetic number, because the mean of its divisors is an integer number (7917129).

Almost surely, 2^21112342 is an apocalyptic number.

21112342 is a deficient number, since it is larger than the sum of its proper divisors (10556174).

21112342 is a wasteful number, since it uses less digits than its factorization.

21112342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10556173.

The product of its digits is 96, while the sum is 16.

The square root of 21112342 is about 4594.8168625093. The cubic root of 21112342 is about 276.3835160574.

Adding to 21112342 its reverse (24321112), we get a palindrome (45433454).

The spelling of 21112342 in words is "twenty-one million, one hundred twelve thousand, three hundred forty-two".