21338273 has 24 divisors (see below), whose sum is σ = 25747680. Its totient is φ = 17487360.

The previous prime is 21338267. The next prime is 21338293. The reversal of 21338273 is 37283312.

It is not a de Polignac number, because 21338273 - 2⁴ = 21338257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110465 + ... + 110657.

It is an arithmetic number, because the mean of its divisors is an integer number (1072820).

Almost surely, 2^21338273 is an apocalyptic number.

21338273 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21338273 is a deficient number, since it is larger than the sum of its proper divisors (4409407).

21338273 is a wasteful number, since it uses less digits than its factorization.

21338273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 246 counting only the distinct ones).

The product of its digits is 6048, while the sum is 29.

The square root of 21338273 is about 4619.3368571690. The cubic root of 21338273 is about 277.3659141731.

The spelling of 21338273 in words is "twenty-one million, three hundred thirty-eight thousand, two hundred seventy-three".