1111221121 has 4 divisors (see below), whose sum is σ = 1111361472. Its totient is φ = 1111080772.

The previous prime is 1111221119. The next prime is 1111221157. The reversal of 1111221121 is 1211221111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1111221121 - 2¹ = 1111221119 is a prime.

It is a super-3 number, since 3×1111221121³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111222121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57541 + ... + 74386.

It is an arithmetic number, because the mean of its divisors is an integer number (277840368).

Almost surely, 2^1111221121 is an apocalyptic number.

It is an amenable number.

1111221121 is a deficient number, since it is larger than the sum of its proper divisors (140351).

1111221121 is an equidigital number, since it uses as much as digits as its factorization.

1111221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140350.

The product of its digits is 8, while the sum is 13.

The square root of 1111221121 is about 33334.9834408238. The cubic root of 1111221121 is about 1035.7783501535.

Adding to 1111221121 its reverse (1211221111), we get a palindrome (2322442232).

The spelling of 1111221121 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".