1211211113221 has 8 divisors (see below), whose sum is σ = 1233054728640. Its totient is φ = 1189411318368.

The previous prime is 1211211113183. The next prime is 1211211113261. The reversal of 1211211113221 is 1223111121121.

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 1211211113221 - 2²⁷ = 1211076895493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211211113261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10899361 + ... + 11009926.

It is an arithmetic number, because the mean of its divisors is an integer number (154131841080).

Almost surely, 2^{1211211113221} is an apocalyptic number.

It is an amenable number.

1211211113221 is a deficient number, since it is larger than the sum of its proper divisors (21843615419).

1211211113221 is an equidigital number, since it uses as much as digits as its factorization.

1211211113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21910283.

The product of its digits is 48, while the sum is 19.

Adding to 1211211113221 its reverse (1223111121121), we get a palindrome (2434322234342).

The spelling of 1211211113221 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred thirteen thousand, two hundred twenty-one".