20668252211 has 2 divisors, whose sum is σ = 20668252212. Its totient is φ = 20668252210.

The previous prime is 20668252183. The next prime is 20668252223. The reversal of 20668252211 is 11225286602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20668252211 - 2²² = 20664057907 is a prime.

It is not a weakly prime, because it can be changed into another prime (20668255211) 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, 10334126105 + 10334126106.

It is an arithmetic number, because the mean of its divisors is an integer number (10334126106).

Almost surely, 2^20668252211 is an apocalyptic number.

20668252211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20668252211 is an equidigital number, since it uses as much as digits as its factorization.

20668252211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 20668252211 in words is "twenty billion, six hundred sixty-eight million, two hundred fifty-two thousand, two hundred eleven".