1211011122211 has 16 divisors (see below), whose sum is σ = 1328199799680. Its totient is φ = 1095007403520.

The previous prime is 1211011122197. The next prime is 1211011122229. The reversal of 1211011122211 is 1122211101121.

It is a cyclic number.

It is not a de Polignac number, because 1211011122211 - 2²¹ = 1211009025059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211011122271) 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, 11758980 + ... + 11861518.

It is an arithmetic number, because the mean of its divisors is an integer number (83012487480).

Almost surely, 2^{1211011122211} is an apocalyptic number.

1211011122211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211011122211 is a deficient number, since it is larger than the sum of its proper divisors (117188677469).

1211011122211 is a wasteful number, since it uses less digits than its factorization.

1211011122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108306.

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

Adding to 1211011122211 its reverse (1122211101121), we get a palindrome (2333222223332).

The spelling of 1211011122211 in words is "one trillion, two hundred eleven billion, eleven million, one hundred twenty-two thousand, two hundred eleven".