21440545342241 has 4 divisors (see below), whose sum is σ = 22132175837184. Its totient is φ = 20748914847300.

The previous prime is 21440545342219. The next prime is 21440545342247. The reversal of 21440545342241 is 14224354504412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21440545342241 - 2¹⁰ = 21440545341217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440545342247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345815247425 + ... + 345815247486.

It is an arithmetic number, because the mean of its divisors is an integer number (5533043959296).

Almost surely, 2^{21440545342241} is an apocalyptic number.

It is an amenable number.

21440545342241 is a deficient number, since it is larger than the sum of its proper divisors (691630494943).

21440545342241 is an equidigital number, since it uses as much as digits as its factorization.

21440545342241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691630494942.

The product of its (nonzero) digits is 614400, while the sum is 41.

Adding to 21440545342241 its reverse (14224354504412), we get a palindrome (35664899846653).

The spelling of 21440545342241 in words is "twenty-one trillion, four hundred forty billion, five hundred forty-five million, three hundred forty-two thousand, two hundred forty-one".