2166221655211 has 2 divisors, whose sum is σ = 2166221655212. Its totient is φ = 2166221655210.

The previous prime is 2166221655187. The next prime is 2166221655337. The reversal of 2166221655211 is 1125561226612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166221655211 - 2²³ = 2166213266603 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166221655011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083110827605 + 1083110827606.

It is an arithmetic number, because the mean of its divisors is an integer number (1083110827606).

Almost surely, 2^{2166221655211} is an apocalyptic number.

2166221655211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166221655211 is an equidigital number, since it uses as much as digits as its factorization.

2166221655211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

The spelling of 2166221655211 in words is "two trillion, one hundred sixty-six billion, two hundred twenty-one million, six hundred fifty-five thousand, two hundred eleven".