21466838 has 4 divisors (see below), whose sum is σ = 32200260. Its totient is φ = 10733418.

The previous prime is 21466831. The next prime is 21466859. The reversal of 21466838 is 83866412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21466831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5366708 + ... + 5366711.

It is an arithmetic number, because the mean of its divisors is an integer number (8050065).

Almost surely, 2^21466838 is an apocalyptic number.

21466838 is a deficient number, since it is larger than the sum of its proper divisors (10733422).

21466838 is a wasteful number, since it uses less digits than its factorization.

21466838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10733421.

The product of its digits is 55296, while the sum is 38.

The square root of 21466838 is about 4633.2319173553. The cubic root of 21466838 is about 277.9218506071.

The spelling of 21466838 in words is "twenty-one million, four hundred sixty-six thousand, eight hundred thirty-eight".