21063136273 has 2 divisors, whose sum is σ = 21063136274. Its totient is φ = 21063136272.

The previous prime is 21063136243. The next prime is 21063136277. The reversal of 21063136273 is 37263136012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18233641024 + 2829495249 = 135032^2 + 53193^2 .

It is a cyclic number.

It is not a de Polignac number, because 21063136273 - 2⁹ = 21063135761 is a prime.

It is not a weakly prime, because it can be changed into another prime (21063136277) 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, 10531568136 + 10531568137.

It is an arithmetic number, because the mean of its divisors is an integer number (10531568137).

Almost surely, 2^21063136273 is an apocalyptic number.

It is an amenable number.

21063136273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21063136273 is an equidigital number, since it uses as much as digits as its factorization.

21063136273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 34.

The spelling of 21063136273 in words is "twenty-one billion, sixty-three million, one hundred thirty-six thousand, two hundred seventy-three".