1111201221023 has 4 divisors (see below), whose sum is σ = 1137043109928. Its totient is φ = 1085359332120.

The previous prime is 1111201220981. The next prime is 1111201221047. The reversal of 1111201221023 is 3201221021111.

It is a happy number.

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 1111201221023 - 2²⁴ = 1111184443807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111201220992 and 1111201221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111201221623) 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 3 ways as a sum of consecutive naturals, for example, 12920944388 + ... + 12920944473.

It is an arithmetic number, because the mean of its divisors is an integer number (284260777482).

Almost surely, 2^{1111201221023} is an apocalyptic number.

1111201221023 is a deficient number, since it is larger than the sum of its proper divisors (25841888905).

1111201221023 is an equidigital number, since it uses as much as digits as its factorization.

1111201221023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25841888904.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1111201221023 its reverse (3201221021111), we get a palindrome (4312422242134).

The spelling of 1111201221023 in words is "one trillion, one hundred eleven billion, two hundred one million, two hundred twenty-one thousand, twenty-three".