111220201222121 has 4 divisors (see below), whose sum is σ = 111221322119892. Its totient is φ = 111219080324352.

The previous prime is 111220201222079. The next prime is 111220201222139. The reversal of 111220201222121 is 121222102022111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2071282248025 + 109148918974096 = 1439195^2 + 10447436^2 .

It is a cyclic number.

It is not a de Polignac number, because 111220201222121 - 2²² = 111220197027817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111220201222093 and 111220201222102.

It is not an unprimeable number, because it can be changed into a prime (111220201225121) 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, 560300036 + ... + 560498501.

It is an arithmetic number, because the mean of its divisors is an integer number (27805330529973).

Almost surely, 2^{111220201222121} is an apocalyptic number.

It is an amenable number.

111220201222121 is a deficient number, since it is larger than the sum of its proper divisors (1120897771).

111220201222121 is an equidigital number, since it uses as much as digits as its factorization.

111220201222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120897770.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111220201222121 its reverse (121222102022111), we get a palindrome (232442303244232).

The spelling of 111220201222121 in words is "one hundred eleven trillion, two hundred twenty billion, two hundred one million, two hundred twenty-two thousand, one hundred twenty-one".