21441882557 has 2 divisors, whose sum is σ = 21441882558. Its totient is φ = 21441882556.

The previous prime is 21441882479. The next prime is 21441882559. The reversal of 21441882557 is 75528814412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15901462201 + 5540420356 = 126101^2 + 74434^2 .

It is a cyclic number.

It is not a de Polignac number, because 21441882557 - 2²⁴ = 21425105341 is a prime.

Together with 21441882559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21441882559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720941278 + 10720941279.

It is an arithmetic number, because the mean of its divisors is an integer number (10720941279).

Almost surely, 2^21441882557 is an apocalyptic number.

It is an amenable number.

21441882557 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441882557 is an equidigital number, since it uses as much as digits as its factorization.

21441882557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 716800, while the sum is 47.

The spelling of 21441882557 in words is "twenty-one billion, four hundred forty-one million, eight hundred eighty-two thousand, five hundred fifty-seven".