21244443053 has 2 divisors, whose sum is σ = 21244443054. Its totient is φ = 21244443052.

The previous prime is 21244443041. The next prime is 21244443067. The reversal of 21244443053 is 35034444212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11148614569 + 10095828484 = 105587^2 + 100478^2 .

It is a cyclic number.

It is not a de Polignac number, because 21244443053 - 2¹⁰ = 21244442029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21244442053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622221526 + 10622221527.

It is an arithmetic number, because the mean of its divisors is an integer number (10622221527).

Almost surely, 2^21244443053 is an apocalyptic number.

It is an amenable number.

21244443053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21244443053 is an equidigital number, since it uses as much as digits as its factorization.

21244443053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 32.

Adding to 21244443053 its reverse (35034444212), we get a palindrome (56278887265).

The spelling of 21244443053 in words is "twenty-one billion, two hundred forty-four million, four hundred forty-three thousand, fifty-three".