111232121221 has 16 divisors (see below), whose sum is σ = 120980530944. Its totient is φ = 101654492544.

The previous prime is 111232121207. The next prime is 111232121227. The reversal of 111232121221 is 122121232111.

It is a cyclic number.

It is not a de Polignac number, because 111232121221 - 2²⁷ = 111097903493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111232121227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7889040 + ... + 7903126.

It is an arithmetic number, because the mean of its divisors is an integer number (7561283184).

Almost surely, 2^111232121221 is an apocalyptic number.

It is an amenable number.

111232121221 is a deficient number, since it is larger than the sum of its proper divisors (9748409723).

111232121221 is a wasteful number, since it uses less digits than its factorization.

111232121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20100.

The product of its digits is 96, while the sum is 19.

Adding to 111232121221 its reverse (122121232111), we get a palindrome (233353353332).

The spelling of 111232121221 in words is "one hundred eleven billion, two hundred thirty-two million, one hundred twenty-one thousand, two hundred twenty-one".