21698275273 has 2 divisors, whose sum is σ = 21698275274. Its totient is φ = 21698275272.

The previous prime is 21698275229. The next prime is 21698275283. The reversal of 21698275273 is 37257289612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21687569289 + 10705984 = 147267^2 + 3272^2 .

It is a cyclic number.

It is not a de Polignac number, because 21698275273 - 2³³ = 13108340681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21698275273.

It is not a weakly prime, because it can be changed into another prime (21698275283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10849137636 + 10849137637.

It is an arithmetic number, because the mean of its divisors is an integer number (10849137637).

Almost surely, 2^21698275273 is an apocalyptic number.

It is an amenable number.

21698275273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21698275273 is an equidigital number, since it uses as much as digits as its factorization.

21698275273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 52.

The spelling of 21698275273 in words is "twenty-one billion, six hundred ninety-eight million, two hundred seventy-five thousand, two hundred seventy-three".