21023235053 has 2 divisors, whose sum is σ = 21023235054. Its totient is φ = 21023235052.

The previous prime is 21023235019. The next prime is 21023235061. The reversal of 21023235053 is 35053232012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18994903684 + 2028331369 = 137822^2 + 45037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21023235053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21023235073) 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, 10511617526 + 10511617527.

It is an arithmetic number, because the mean of its divisors is an integer number (10511617527).

Almost surely, 2^21023235053 is an apocalyptic number.

It is an amenable number.

21023235053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023235053 is an equidigital number, since it uses as much as digits as its factorization.

21023235053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 21023235053 its reverse (35053232012), we get a palindrome (56076467065).

The spelling of 21023235053 in words is "twenty-one billion, twenty-three million, two hundred thirty-five thousand, fifty-three".