21144545353 has 2 divisors, whose sum is σ = 21144545354. Its totient is φ = 21144545352.

The previous prime is 21144545327. The next prime is 21144545407. The reversal of 21144545353 is 35354544112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12865911184 + 8278634169 = 113428^2 + 90987^2 .

It is a cyclic number.

It is not a de Polignac number, because 21144545353 - 2²⁵ = 21110990921 is a prime.

It is not a weakly prime, because it can be changed into another prime (21144545053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572272676 + 10572272677.

It is an arithmetic number, because the mean of its divisors is an integer number (10572272677).

Almost surely, 2^21144545353 is an apocalyptic number.

It is an amenable number.

21144545353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144545353 is an equidigital number, since it uses as much as digits as its factorization.

21144545353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144000, while the sum is 37.

The spelling of 21144545353 in words is "twenty-one billion, one hundred forty-four million, five hundred forty-five thousand, three hundred fifty-three".