220111101221 has 4 divisors (see below), whose sum is σ = 240121201344. Its totient is φ = 200101001100.

The previous prime is 220111101187. The next prime is 220111101227. The reversal of 220111101221 is 122101111022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 220111101221 - 2¹⁸ = 220110839077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220111101196 and 220111101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220111101227) 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, 10005050045 + ... + 10005050066.

It is an arithmetic number, because the mean of its divisors is an integer number (60030300336).

Almost surely, 2^220111101221 is an apocalyptic number.

It is an amenable number.

220111101221 is a deficient number, since it is larger than the sum of its proper divisors (20010100123).

220111101221 is a wasteful number, since it uses less digits than its factorization.

220111101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20010100122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 220111101221 its reverse (122101111022), we get a palindrome (342212212243).

The spelling of 220111101221 in words is "two hundred twenty billion, one hundred eleven million, one hundred one thousand, two hundred twenty-one".