1211220022211 has 2 divisors, whose sum is σ = 1211220022212. Its totient is φ = 1211220022210.

The previous prime is 1211220022163. The next prime is 1211220022213. The reversal of 1211220022211 is 1122200221121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211220022211 - 2³⁴ = 1194040153027 is a prime.

Together with 1211220022213, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211220022211.

It is not a weakly prime, because it can be changed into another prime (1211220022213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605610011105 + 605610011106.

It is an arithmetic number, because the mean of its divisors is an integer number (605610011106).

Almost surely, 2^{1211220022211} is an apocalyptic number.

1211220022211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211220022211 is an equidigital number, since it uses as much as digits as its factorization.

1211220022211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1211220022211 its reverse (1122200221121), we get a palindrome (2333420243332).

The spelling of 1211220022211 in words is "one trillion, two hundred eleven billion, two hundred twenty million, twenty-two thousand, two hundred eleven".