156221211111211 has 2 divisors, whose sum is σ = 156221211111212. Its totient is φ = 156221211111210.

The previous prime is 156221211111157. The next prime is 156221211111223. The reversal of 156221211111211 is 112111112122651.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 156221211111211 - 2²⁵ = 156221177556779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 156221211111211.

It is not a weakly prime, because it can be changed into another prime (156221211111241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78110605555605 + 78110605555606.

It is an arithmetic number, because the mean of its divisors is an integer number (78110605555606).

Almost surely, 2^{156221211111211} is an apocalyptic number.

156221211111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

156221211111211 is an equidigital number, since it uses as much as digits as its factorization.

156221211111211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 28.

Adding to 156221211111211 its reverse (112111112122651), we get a palindrome (268332323233862).

The spelling of 156221211111211 in words is "one hundred fifty-six trillion, two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred eleven".