220121111 has 16 divisors (see below), whose sum is σ = 260198400. Its totient is φ = 182226240.

The previous prime is 220121093. The next prime is 220121141. The reversal of 220121111 is 111121022.

220121111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220121111 - 2⁶ = 220121047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220121092 and 220121101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121141) 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, 209315 + ... + 210363.

It is an arithmetic number, because the mean of its divisors is an integer number (16262400).

Almost surely, 2^220121111 is an apocalyptic number.

220121111 is a deficient number, since it is larger than the sum of its proper divisors (40077289).

220121111 is a wasteful number, since it uses less digits than its factorization.

220121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 220121111 is about 14836.4790634436. The cubic root of 220121111 is about 603.7918297500.

Adding to 220121111 its reverse (111121022), we get a palindrome (331242133).

The spelling of 220121111 in words is "two hundred twenty million, one hundred twenty-one thousand, one hundred eleven".