21302123053 has 2 divisors, whose sum is σ = 21302123054. Its totient is φ = 21302123052.

The previous prime is 21302123021. The next prime is 21302123069. The reversal of 21302123053 is 35032120312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14137685604 + 7164437449 = 118902^2 + 84643^2 .

It is a cyclic number.

It is not a de Polignac number, because 21302123053 - 2⁵ = 21302123021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21302121053) 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, 10651061526 + 10651061527.

It is an arithmetic number, because the mean of its divisors is an integer number (10651061527).

Almost surely, 2^21302123053 is an apocalyptic number.

It is an amenable number.

21302123053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302123053 is an equidigital number, since it uses as much as digits as its factorization.

21302123053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21302123053 its reverse (35032120312), we get a palindrome (56334243365).

The spelling of 21302123053 in words is "twenty-one billion, three hundred two million, one hundred twenty-three thousand, fifty-three".