21103591273 has 2 divisors, whose sum is σ = 21103591274. Its totient is φ = 21103591272.

The previous prime is 21103591259. The next prime is 21103591277. The reversal of 21103591273 is 37219530112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20838943449 + 264647824 = 144357^2 + 16268^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103591273 - 2⁵ = 21103591241 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103591277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551795636 + 10551795637.

It is an arithmetic number, because the mean of its divisors is an integer number (10551795637).

Almost surely, 2^21103591273 is an apocalyptic number.

It is an amenable number.

21103591273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103591273 is an equidigital number, since it uses as much as digits as its factorization.

21103591273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 34.

The spelling of 21103591273 in words is "twenty-one billion, one hundred three million, five hundred ninety-one thousand, two hundred seventy-three".