21312444241013 has 6 divisors (see below), whose sum is σ = 22022119804662. Its totient is φ = 20624946038760.

The previous prime is 21312444241007. The next prime is 21312444241093. The reversal of 21312444241013 is 31014244421312.

It can be written as a sum of positive squares in only one way, i.e., 13368039750289 + 7944404490724 = 3656233^2 + 2818582^2 .

It is not a de Polignac number, because 21312444241013 - 2²⁴ = 21312427463797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312444241093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11088679706 + ... + 11088681627.

It is an arithmetic number, because the mean of its divisors is an integer number (3670353300777).

Almost surely, 2^{21312444241013} is an apocalyptic number.

It is an amenable number.

21312444241013 is a deficient number, since it is larger than the sum of its proper divisors (709675563649).

21312444241013 is an equidigital number, since it uses as much as digits as its factorization.

21312444241013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22177361395 (or 22177361364 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 21312444241013 its reverse (31014244421312), we get a palindrome (52326688662325).

The spelling of 21312444241013 in words is "twenty-one trillion, three hundred twelve billion, four hundred forty-four million, two hundred forty-one thousand, thirteen".