21342112 has 24 divisors (see below), whose sum is σ = 45837792. Its totient is φ = 9700800.

The previous prime is 21342071. The next prime is 21342119. The reversal of 21342112 is 21124312.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21342119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29964 + ... + 30667.

It is an arithmetic number, because the mean of its divisors is an integer number (1909908).

Almost surely, 2^21342112 is an apocalyptic number.

21342112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21342112 is an abundant number, since it is smaller than the sum of its proper divisors (24495680).

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

21342112 is a wasteful number, since it uses less digits than its factorization.

21342112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60652 (or 60644 counting only the distinct ones).

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

The square root of 21342112 is about 4619.7523743162. The cubic root of 21342112 is about 277.3825469452.

Adding to 21342112 its reverse (21124312), we get a palindrome (42466424).

The spelling of 21342112 in words is "twenty-one million, three hundred forty-two thousand, one hundred twelve".