21241044420243 has 16 divisors (see below), whose sum is σ = 28431992252160. Its totient is φ = 14105443849184.

The previous prime is 21241044420221. The next prime is 21241044420353. The reversal of 21241044420243 is 34202444014212.

It is a cyclic number.

It is not a de Polignac number, because 21241044420243 - 2¹⁶ = 21241044354707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21241044420443) 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, 4133421 + ... + 7717982.

It is an arithmetic number, because the mean of its divisors is an integer number (1776999515760).

Almost surely, 2^{21241044420243} is an apocalyptic number.

21241044420243 is a deficient number, since it is larger than the sum of its proper divisors (7190947831917).

21241044420243 is a wasteful number, since it uses less digits than its factorization.

21241044420243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11853738.

The product of its (nonzero) digits is 49152, while the sum is 33.

Adding to 21241044420243 its reverse (34202444014212), we get a palindrome (55443488434455).

The spelling of 21241044420243 in words is "twenty-one trillion, two hundred forty-one billion, forty-four million, four hundred twenty thousand, two hundred forty-three".