21123411053 has 2 divisors, whose sum is σ = 21123411054. Its totient is φ = 21123411052.

The previous prime is 21123410999. The next prime is 21123411061. The reversal of 21123411053 is 35011432112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18627609289 + 2495801764 = 136483^2 + 49958^2 .

It is a cyclic number.

It is not a de Polignac number, because 21123411053 - 2²⁰ = 21122362477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21123411073) 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, 10561705526 + 10561705527.

It is an arithmetic number, because the mean of its divisors is an integer number (10561705527).

Almost surely, 2^21123411053 is an apocalyptic number.

It is an amenable number.

21123411053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123411053 is an equidigital number, since it uses as much as digits as its factorization.

21123411053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21123411053 its reverse (35011432112), we get a palindrome (56134843165).

The spelling of 21123411053 in words is "twenty-one billion, one hundred twenty-three million, four hundred eleven thousand, fifty-three".