21483221 has 8 divisors (see below), whose sum is σ = 22206744. Its totient is φ = 20769280.

The previous prime is 21483211. The next prime is 21483233. The reversal of 21483221 is 12238412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2464900 + 19018321 = 1570^2 + 4361^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21483221 - 2⁶ = 21483157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21483211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2315 + ... + 6951.

It is an arithmetic number, because the mean of its divisors is an integer number (2775843).

Almost surely, 2^21483221 is an apocalyptic number.

It is an amenable number.

21483221 is a deficient number, since it is larger than the sum of its proper divisors (723523).

21483221 is a wasteful number, since it uses less digits than its factorization.

21483221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4791.

The product of its digits is 768, while the sum is 23.

The square root of 21483221 is about 4634.9995685005. Note that the first 3 decimals coincide. The cubic root of 21483221 is about 277.9925338298.

The spelling of 21483221 in words is "twenty-one million, four hundred eighty-three thousand, two hundred twenty-one".