21839241 has 8 divisors (see below), whose sum is σ = 29143584. Its totient is φ = 14547200.

The previous prime is 21839231. The next prime is 21839249. The reversal of 21839241 is 14293812.

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 21839241 - 2⁶ = 21839177 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21839199 and 21839208.

It is not an unprimeable number, because it can be changed into a prime (21839249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2530 + ... + 7076.

It is an arithmetic number, because the mean of its divisors is an integer number (3642948).

Almost surely, 2^21839241 is an apocalyptic number.

It is an amenable number.

21839241 is a deficient number, since it is larger than the sum of its proper divisors (7304343).

21839241 is a wasteful number, since it uses less digits than its factorization.

21839241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6151.

The product of its digits is 3456, while the sum is 30.

The square root of 21839241 is about 4673.2473720102. The cubic root of 21839241 is about 279.5197592712.

The spelling of 21839241 in words is "twenty-one million, eight hundred thirty-nine thousand, two hundred forty-one".