21342418 has 16 divisors (see below), whose sum is σ = 33010560. Its totient is φ = 10343376.

The previous prime is 21342407. The next prime is 21342421. The reversal of 21342418 is 81424312.

It is a junction number, because it is equal to n+sod(n) for n = 21342392 and 21342401.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9205 + ... + 11287.

It is an arithmetic number, because the mean of its divisors is an integer number (2063160).

Almost surely, 2^21342418 is an apocalyptic number.

21342418 is a deficient number, since it is larger than the sum of its proper divisors (11668142).

21342418 is a wasteful number, since it uses less digits than its factorization.

21342418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241.

The product of its digits is 1536, while the sum is 25.

The square root of 21342418 is about 4619.7854928557. The cubic root of 21342418 is about 277.3838726287.

The spelling of 21342418 in words is "twenty-one million, three hundred forty-two thousand, four hundred eighteen".