1211222222011 has 8 divisors (see below), whose sum is σ = 1258257567104. Its totient is φ = 1164684605760.

The previous prime is 1211222221991. The next prime is 1211222222087. The reversal of 1211222222011 is 1102222221121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211222222011 - 2⁷ = 1211222221883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211222222011.

It is not an unprimeable number, because it can be changed into a prime (1211222222611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124427250 + ... + 124436983.

It is an arithmetic number, because the mean of its divisors is an integer number (157282195888).

Almost surely, 2^{1211222222011} is an apocalyptic number.

1211222222011 is a deficient number, since it is larger than the sum of its proper divisors (47035345093).

1211222222011 is a wasteful number, since it uses less digits than its factorization.

1211222222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248864421.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1211222222011 its reverse (1102222221121), we get a palindrome (2313444443132).

The spelling of 1211222222011 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twenty-two thousand, eleven".