21244003441 has 4 divisors (see below), whose sum is σ = 21244841892. Its totient is φ = 21243164992.

The previous prime is 21244003433. The next prime is 21244003453. The reversal of 21244003441 is 14430044212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12922915041 + 8321088400 = 113679^2 + 91220^2 .

It is a cyclic number.

It is not a de Polignac number, because 21244003441 - 2³ = 21244003433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21244003141) 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, 379996 + ... + 432301.

It is an arithmetic number, because the mean of its divisors is an integer number (5311210473).

Almost surely, 2^21244003441 is an apocalyptic number.

It is an amenable number.

21244003441 is a deficient number, since it is larger than the sum of its proper divisors (838451).

21244003441 is an equidigital number, since it uses as much as digits as its factorization.

21244003441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838450.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21244003441 its reverse (14430044212), we get a palindrome (35674047653).

The spelling of 21244003441 in words is "twenty-one billion, two hundred forty-four million, three thousand, four hundred forty-one".