1211122221011 has 8 divisors (see below), whose sum is σ = 1214242407840. Its totient is φ = 1208003677632.

The previous prime is 1211122220999. The next prime is 1211122221031. The reversal of 1211122221011 is 1101222211121.

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 1211122221011 - 2³⁴ = 1193942351827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211122221031) 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, 1071791 + ... + 1889703.

It is an arithmetic number, because the mean of its divisors is an integer number (151780300980).

Almost surely, 2^{1211122221011} is an apocalyptic number.

1211122221011 is a deficient number, since it is larger than the sum of its proper divisors (3120186829).

1211122221011 is an equidigital number, since it uses as much as digits as its factorization.

1211122221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821725.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211122221011 its reverse (1101222211121), we get a palindrome (2312344432132).

The spelling of 1211122221011 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred twenty-one thousand, eleven".