21441103639 has 2 divisors, whose sum is σ = 21441103640. Its totient is φ = 21441103638.

The previous prime is 21441103637. The next prime is 21441103643. The reversal of 21441103639 is 93630114412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21441103639 - 2¹ = 21441103637 is a prime.

Together with 21441103637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21441103633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720551819 + 10720551820.

It is an arithmetic number, because the mean of its divisors is an integer number (10720551820).

Almost surely, 2^21441103639 is an apocalyptic number.

21441103639 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441103639 is an equidigital number, since it uses as much as digits as its factorization.

21441103639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 21441103639 in words is "twenty-one billion, four hundred forty-one million, one hundred three thousand, six hundred thirty-nine".