1111220121311 has 4 divisors (see below), whose sum is σ = 1115351051400. Its totient is φ = 1107089191224.

The previous prime is 1111220121269. The next prime is 1111220121331. The reversal of 1111220121311 is 1131210221111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1111220121311 - 2¹⁰ = 1111220120287 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 1111220121311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111220121331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065464641 + ... + 2065465178.

It is an arithmetic number, because the mean of its divisors is an integer number (278837762850).

Almost surely, 2^{1111220121311} is an apocalyptic number.

1111220121311 is a deficient number, since it is larger than the sum of its proper divisors (4130930089).

1111220121311 is an equidigital number, since it uses as much as digits as its factorization.

1111220121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130930088.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 1111220121311 its reverse (1131210221111), we get a palindrome (2242430342422).

The spelling of 1111220121311 in words is "one trillion, one hundred eleven billion, two hundred twenty million, one hundred twenty-one thousand, three hundred eleven".