21142112 has 24 divisors (see below), whose sum is σ = 42309792. Its totient is φ = 10396800.

The previous prime is 21142109. The next prime is 21142123. The reversal of 21142112 is 21124112.

It is a happy number.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3464 + ... + 7367.

It is an arithmetic number, because the mean of its divisors is an integer number (1762908).

Almost surely, 2^21142112 is an apocalyptic number.

It is an amenable number.

21142112 is an abundant number, since it is smaller than the sum of its proper divisors (21167680).

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

21142112 is a wasteful number, since it uses less digits than its factorization.

21142112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10902 (or 10894 counting only the distinct ones).

The product of its digits is 32, while the sum is 14.

The square root of 21142112 is about 4598.0552410775. The cubic root of 21142112 is about 276.5133622703.

Adding to 21142112 its reverse (21124112), we get a palindrome (42266224).

The spelling of 21142112 in words is "twenty-one million, one hundred forty-two thousand, one hundred twelve".