1211102211 has 16 divisors (see below), whose sum is σ = 1779049728. Its totient is φ = 726732000.

The previous prime is 1211102183. The next prime is 1211102257. The reversal of 1211102211 is 1122011121.

It is not a de Polignac number, because 1211102211 - 2¹⁰ = 1211101187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211102411) 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, 178351 + ... + 185016.

It is an arithmetic number, because the mean of its divisors is an integer number (111190608).

Almost surely, 2^1211102211 is an apocalyptic number.

1211102211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211102211 is a deficient number, since it is larger than the sum of its proper divisors (567947517).

1211102211 is a wasteful number, since it uses less digits than its factorization.

1211102211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363482.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1211102211 is about 34800.8938247281. The cubic root of 1211102211 is about 1065.9256973884.

Adding to 1211102211 its reverse (1122011121), we get a palindrome (2333113332).

It can be divided in two parts, 121110 and 2211, that added together give a palindrome (123321).

The spelling of 1211102211 in words is "one billion, two hundred eleven million, one hundred two thousand, two hundred eleven".