1111331111221 has 8 divisors (see below), whose sum is σ = 1112916692160. Its totient is φ = 1109745688128.

The previous prime is 1111331111203. The next prime is 1111331111251. The reversal of 1111331111221 is 1221111331111.

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 1111331111221 - 2¹⁵ = 1111331078453 is a prime.

It is a super-2 number, since 2×1111331111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111331111251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28398150 + ... + 28437256.

It is an arithmetic number, because the mean of its divisors is an integer number (139114586520).

Almost surely, 2^{1111331111221} is an apocalyptic number.

It is an amenable number.

1111331111221 is a deficient number, since it is larger than the sum of its proper divisors (1585580939).

1111331111221 is an equidigital number, since it uses as much as digits as its factorization.

1111331111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78923.

The product of its digits is 36, while the sum is 19.

Adding to 1111331111221 its reverse (1221111331111), we get a palindrome (2332442442332).

The spelling of 1111331111221 in words is "one trillion, one hundred eleven billion, three hundred thirty-one million, one hundred eleven thousand, two hundred twenty-one".