21041418 has 16 divisors (see below), whose sum is σ = 42676416. Its totient is φ = 6914880.

The previous prime is 21041411. The next prime is 21041429. The reversal of 21041418 is 81414012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21041394 and 21041403.

It is not an unprimeable number, because it can be changed into a prime (21041411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24271 + ... + 25122.

It is an arithmetic number, because the mean of its divisors is an integer number (2667276).

Almost surely, 2^21041418 is an apocalyptic number.

21041418 is an abundant number, since it is smaller than the sum of its proper divisors (21634998).

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

21041418 is a wasteful number, since it uses less digits than its factorization.

21041418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49469.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 21041418 is about 4587.0925432130. The cubic root of 21041418 is about 276.0736780825.

The spelling of 21041418 in words is "twenty-one million, forty-one thousand, four hundred eighteen".