21441018 has 8 divisors (see below), whose sum is σ = 42882048. Its totient is φ = 7147004.

The previous prime is 21441011. The next prime is 21441031. The reversal of 21441018 is 81014412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21441018 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21440985 and 21441003.

It is not an unprimeable number, because it can be changed into a prime (21441011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1786746 + ... + 1786757.

It is an arithmetic number, because the mean of its divisors is an integer number (5360256).

Almost surely, 2^21441018 is an apocalyptic number.

21441018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21441018 is a wasteful number, since it uses less digits than its factorization.

21441018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573508.

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

The square root of 21441018 is about 4630.4446870684. Note that the first 3 decimals coincide. The cubic root of 21441018 is about 277.8103791188.

The spelling of 21441018 in words is "twenty-one million, four hundred forty-one thousand, eighteen".