21355073053 has 2 divisors, whose sum is σ = 21355073054. Its totient is φ = 21355073052.

The previous prime is 21355073023. The next prime is 21355073057. The reversal of 21355073053 is 35037055312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12371445529 + 8983627524 = 111227^2 + 94782^2 .

It is a cyclic number.

It is not a de Polignac number, because 21355073053 - 2⁵ = 21355073021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21355073057) 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, 10677536526 + 10677536527.

It is an arithmetic number, because the mean of its divisors is an integer number (10677536527).

Almost surely, 2^21355073053 is an apocalyptic number.

It is an amenable number.

21355073053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355073053 is an equidigital number, since it uses as much as digits as its factorization.

21355073053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47250, while the sum is 34.

The spelling of 21355073053 in words is "twenty-one billion, three hundred fifty-five million, seventy-three thousand, fifty-three".