21342118 has 16 divisors (see below), whose sum is σ = 37576224. Its totient is φ = 8899200.

The previous prime is 21342071. The next prime is 21342119. The reversal of 21342118 is 81124312.

It is a happy number.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20083 + ... + 21118.

It is an arithmetic number, because the mean of its divisors is an integer number (2348514).

Almost surely, 2^21342118 is an apocalyptic number.

21342118 is a deficient number, since it is larger than the sum of its proper divisors (16234106).

21342118 is a wasteful number, since it uses less digits than its factorization.

21342118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41247.

The product of its digits is 384, while the sum is 22.

The square root of 21342118 is about 4619.7530237016. The cubic root of 21342118 is about 277.3825729391.

The spelling of 21342118 in words is "twenty-one million, three hundred forty-two thousand, one hundred eighteen".