21443141455121 has 2 divisors, whose sum is σ = 21443141455122. Its totient is φ = 21443141455120.

The previous prime is 21443141455111. The next prime is 21443141455123. The reversal of 21443141455121 is 12155414134412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12891546630400 + 8551594824721 = 3590480^2 + 2924311^2 .

It is a cyclic number.

It is not a de Polignac number, because 21443141455121 - 2³⁸ = 21168263548177 is a prime.

Together with 21443141455123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21443141455123) 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, 10721570727560 + 10721570727561.

It is an arithmetic number, because the mean of its divisors is an integer number (10721570727561).

Almost surely, 2^{21443141455121} is an apocalyptic number.

It is an amenable number.

21443141455121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443141455121 is an equidigital number, since it uses as much as digits as its factorization.

21443141455121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76800, while the sum is 38.

Adding to 21443141455121 its reverse (12155414134412), we get a palindrome (33598555589533).

The spelling of 21443141455121 in words is "twenty-one trillion, four hundred forty-three billion, one hundred forty-one million, four hundred fifty-five thousand, one hundred twenty-one".