1111023121 has 8 divisors (see below), whose sum is σ = 1224312320. Its totient is φ = 1001709072.

The previous prime is 1111023113. The next prime is 1111023149. The reversal of 1111023121 is 1213201111.

It is a happy number.

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

It is not a de Polignac number, because 1111023121 - 2³ = 1111023113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111023101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 993201 + ... + 994318.

It is an arithmetic number, because the mean of its divisors is an integer number (153039040).

Almost surely, 2^1111023121 is an apocalyptic number.

It is an amenable number.

1111023121 is a deficient number, since it is larger than the sum of its proper divisors (113289199).

1111023121 is a wasteful number, since it uses less digits than its factorization.

1111023121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1987575.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1111023121 is about 33332.0134555355. The cubic root of 1111023121 is about 1035.7168273562.

Adding to 1111023121 its reverse (1213201111), we get a palindrome (2324224232).

The spelling of 1111023121 in words is "one billion, one hundred eleven million, twenty-three thousand, one hundred twenty-one".