21383241 has 12 divisors (see below), whose sum is σ = 31339056. Its totient is φ = 12959320.

The previous prime is 21383239. The next prime is 21383249. The reversal of 21383241 is 14238312.

It is not a de Polignac number, because 21383241 - 2¹ = 21383239 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21383249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29091 + ... + 29816.

It is an arithmetic number, because the mean of its divisors is an integer number (2611588).

Almost surely, 2^21383241 is an apocalyptic number.

It is an amenable number.

21383241 is a deficient number, since it is larger than the sum of its proper divisors (9955815).

21383241 is a wasteful number, since it uses less digits than its factorization.

21383241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58932 (or 58921 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 21383241 is about 4624.2016608275. The cubic root of 21383241 is about 277.5606165771.

Subtracting from 21383241 its reverse (14238312), we obtain a square (7144929 = 2673²).

The spelling of 21383241 in words is "twenty-one million, three hundred eighty-three thousand, two hundred forty-one".