220121110111 has 4 divisors (see below), whose sum is σ = 251566982992. Its totient is φ = 188675237232.

The previous prime is 220121110109. The next prime is 220121110117. The reversal of 220121110111 is 111011121022.

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 220121110111 - 2¹ = 220121110109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220121110091 and 220121110100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121110117) 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, 15722936430 + ... + 15722936443.

It is an arithmetic number, because the mean of its divisors is an integer number (62891745748).

Almost surely, 2^220121110111 is an apocalyptic number.

220121110111 is a deficient number, since it is larger than the sum of its proper divisors (31445872881).

220121110111 is an equidigital number, since it uses as much as digits as its factorization.

220121110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31445872880.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 220121110111 its reverse (111011121022), we get a palindrome (331132231133).

The spelling of 220121110111 in words is "two hundred twenty billion, one hundred twenty-one million, one hundred ten thousand, one hundred eleven".