21466442 has 8 divisors (see below), whose sum is σ = 32745600. Its totient is φ = 10551244.

The previous prime is 21466441. The next prime is 21466457. The reversal of 21466442 is 24466412.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21466441) 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, 90842 + ... + 91077.

It is an arithmetic number, because the mean of its divisors is an integer number (4093200).

Almost surely, 2^21466442 is an apocalyptic number.

21466442 is a deficient number, since it is larger than the sum of its proper divisors (11279158).

21466442 is a wasteful number, since it uses less digits than its factorization.

21466442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181980.

The product of its digits is 9216, while the sum is 29.

The square root of 21466442 is about 4633.1891824099. The cubic root of 21466442 is about 277.9201416498.

The spelling of 21466442 in words is "twenty-one million, four hundred sixty-six thousand, four hundred forty-two".