1211001122211 has 16 divisors (see below), whose sum is σ = 1699676745600. Its totient is φ = 764831092608.

The previous prime is 1211001122207. The next prime is 1211001122239. The reversal of 1211001122211 is 1122211001121.

It is a happy number.

It is not a de Polignac number, because 1211001122211 - 2² = 1211001122207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211001122011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5028820 + ... + 5264126.

It is an arithmetic number, because the mean of its divisors is an integer number (106229796600).

Almost surely, 2^{1211001122211} is an apocalyptic number.

1211001122211 is a deficient number, since it is larger than the sum of its proper divisors (488675623389).

1211001122211 is a wasteful number, since it uses less digits than its factorization.

1211001122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325618.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211001122211 its reverse (1122211001121), we get a palindrome (2333212123332).

The spelling of 1211001122211 in words is "one trillion, two hundred eleven billion, one million, one hundred twenty-two thousand, two hundred eleven".