21140241 has 8 divisors (see below), whose sum is σ = 28262880. Its totient is φ = 14055552.

The previous prime is 21140239. The next prime is 21140291. The reversal of 21140241 is 14204112.

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

It is not a de Polignac number, because 21140241 - 2¹ = 21140239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21140241.

It is not an unprimeable number, because it can be changed into a prime (21140201) 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, 8160 + ... + 10433.

It is an arithmetic number, because the mean of its divisors is an integer number (3532860).

Almost surely, 2^21140241 is an apocalyptic number.

It is an amenable number.

21140241 is a deficient number, since it is larger than the sum of its proper divisors (7122639).

21140241 is a wasteful number, since it uses less digits than its factorization.

21140241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18975.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21140241 is about 4597.8517809951. The cubic root of 21140241 is about 276.5052052208.

Adding to 21140241 its reverse (14204112), we get a palindrome (35344353).

The spelling of 21140241 in words is "twenty-one million, one hundred forty thousand, two hundred forty-one".