21400243241 has 16 divisors (see below), whose sum is σ = 23409456000. Its totient is φ = 19443991680.

The previous prime is 21400243213. The next prime is 21400243279. The reversal of 21400243241 is 14234200412.

It is a cyclic number.

It is not a de Polignac number, because 21400243241 - 2¹⁰ = 21400242217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21400243141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450956 + ... + 496146.

It is an arithmetic number, because the mean of its divisors is an integer number (1463091000).

Almost surely, 2^21400243241 is an apocalyptic number.

It is an amenable number.

21400243241 is a deficient number, since it is larger than the sum of its proper divisors (2009212759).

21400243241 is a wasteful number, since it uses less digits than its factorization.

21400243241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45776.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21400243241 its reverse (14234200412), we get a palindrome (35634443653).

The spelling of 21400243241 in words is "twenty-one billion, four hundred million, two hundred forty-three thousand, two hundred forty-one".