111220122121211 has 4 divisors (see below), whose sum is σ = 111220313775912. Its totient is φ = 111219930466512.

The previous prime is 111220122121189. The next prime is 111220122121219. The reversal of 111220122121211 is 112121221022111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 111220122121211 - 2¹⁴ = 111220122104827 is a prime.

It is a super-2 number, since 2×111220122121211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111220122121219) 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, 94954226 + ... + 96118391.

It is an arithmetic number, because the mean of its divisors is an integer number (27805078443978).

Almost surely, 2^{111220122121211} is an apocalyptic number.

111220122121211 is a deficient number, since it is larger than the sum of its proper divisors (191654701).

111220122121211 is an equidigital number, since it uses as much as digits as its factorization.

111220122121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191654700.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111220122121211 its reverse (112121221022111), we get a palindrome (223341343143322).

The spelling of 111220122121211 in words is "one hundred eleven trillion, two hundred twenty billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".