27221722691 has 2 divisors, whose sum is σ = 27221722692. Its totient is φ = 27221722690.

The previous prime is 27221722681. The next prime is 27221722711. The reversal of 27221722691 is 19622712272.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27221722691 - 2¹⁴ = 27221706307 is a prime.

It is not a weakly prime, because it can be changed into another prime (27221722681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13610861345 + 13610861346.

It is an arithmetic number, because the mean of its divisors is an integer number (13610861346).

Almost surely, 2^27221722691 is an apocalyptic number.

27221722691 is a deficient number, since it is larger than the sum of its proper divisors (1).

27221722691 is an equidigital number, since it uses as much as digits as its factorization.

27221722691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The spelling of 27221722691 in words is "twenty-seven billion, two hundred twenty-one million, seven hundred twenty-two thousand, six hundred ninety-one".