21094696289 has 2 divisors, whose sum is σ = 21094696290. Its totient is φ = 21094696288.

The previous prime is 21094696277. The next prime is 21094696297. The reversal of 21094696289 is 98269649012.

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., 21085363264 + 9333025 = 145208^2 + 3055^2 .

It is a cyclic number.

It is not a de Polignac number, because 21094696289 - 2⁸ = 21094696033 is a prime.

It is not a weakly prime, because it can be changed into another prime (21094696219) 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, 10547348144 + 10547348145.

It is an arithmetic number, because the mean of its divisors is an integer number (10547348145).

Almost surely, 2^21094696289 is an apocalyptic number.

It is an amenable number.

21094696289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21094696289 is an equidigital number, since it uses as much as digits as its factorization.

21094696289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 56.

The spelling of 21094696289 in words is "twenty-one billion, ninety-four million, six hundred ninety-six thousand, two hundred eighty-nine".