220111021 has 8 divisors (see below), whose sum is σ = 237214880. Its totient is φ = 203031792.

The previous prime is 220110967. The next prime is 220111027. The reversal of 220111021 is 120111022.

220111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220111021 - 2¹³ = 220102829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220110989 and 220111007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220111027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15166 + ... + 25888.

It is an arithmetic number, because the mean of its divisors is an integer number (29651860).

Almost surely, 2^220111021 is an apocalyptic number.

It is an amenable number.

220111021 is a deficient number, since it is larger than the sum of its proper divisors (17103859).

220111021 is a wasteful number, since it uses less digits than its factorization.

220111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12315.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 220111021 is about 14836.1390193001. The cubic root of 220111021 is about 603.7826039915.

Adding to 220111021 its reverse (120111022), we get a palindrome (340222043).

Subtracting from 220111021 its reverse (120111022), we obtain a palindrome (99999999).

It can be divided in two parts, 22011 and 1021, that added together give a palindrome (23032).

The spelling of 220111021 in words is "two hundred twenty million, one hundred eleven thousand, twenty-one".