1211201222011 has 16 divisors (see below), whose sum is σ = 1339989868800. Its totient is φ = 1085527424800.

The previous prime is 1211201221999. The next prime is 1211201222027. The reversal of 1211201222011 is 1102221021121.

It is a cyclic number.

It is not a de Polignac number, because 1211201222011 - 2²⁷ = 1211067004283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211201222711) 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, 25115520 + ... + 25163698.

It is an arithmetic number, because the mean of its divisors is an integer number (83749366800).

Almost surely, 2^{1211201222011} is an apocalyptic number.

1211201222011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211201222011 is a deficient number, since it is larger than the sum of its proper divisors (128788646789).

1211201222011 is a wasteful number, since it uses less digits than its factorization.

1211201222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80450.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211201222011 its reverse (1102221021121), we get a palindrome (2313422243132).

The spelling of 1211201222011 in words is "one trillion, two hundred eleven billion, two hundred one million, two hundred twenty-two thousand, eleven".