21444311453 has 2 divisors, whose sum is σ = 21444311454. Its totient is φ = 21444311452.

The previous prime is 21444311423. The next prime is 21444311489. The reversal of 21444311453 is 35411344412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18092133049 + 3352178404 = 134507^2 + 57898^2 .

It is a cyclic number.

It is not a de Polignac number, because 21444311453 - 2⁶ = 21444311389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21444311423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722155726 + 10722155727.

It is an arithmetic number, because the mean of its divisors is an integer number (10722155727).

Almost surely, 2^21444311453 is an apocalyptic number.

It is an amenable number.

21444311453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444311453 is an equidigital number, since it uses as much as digits as its factorization.

21444311453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 32.

Adding to 21444311453 its reverse (35411344412), we get a palindrome (56855655865).

The spelling of 21444311453 in words is "twenty-one billion, four hundred forty-four million, three hundred eleven thousand, four hundred fifty-three".