111221210121 has 8 divisors (see below), whose sum is σ = 169479939264. Its totient is φ = 63554977200.

The previous prime is 111221210117. The next prime is 111221210167. The reversal of 111221210121 is 121012122111.

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 111221210121 - 2² = 111221210117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111221210121.

It is not an unprimeable number, because it can be changed into a prime (111221210021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2648124030 + ... + 2648124071.

It is an arithmetic number, because the mean of its divisors is an integer number (21184992408).

Almost surely, 2^111221210121 is an apocalyptic number.

It is an amenable number.

111221210121 is a deficient number, since it is larger than the sum of its proper divisors (58258729143).

111221210121 is an equidigital number, since it uses as much as digits as its factorization.

111221210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5296248111.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111221210121 its reverse (121012122111), we get a palindrome (232233332232).

The spelling of 111221210121 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".