220101111221 has 4 divisors (see below), whose sum is σ = 223201126944. Its totient is φ = 217001095500.

The previous prime is 220101111143. The next prime is 220101111227. The reversal of 220101111221 is 122111101022.

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 a cyclic number.

It is not a de Polignac number, because 220101111221 - 2¹⁰ = 220101110197 is a prime.

It is a super-2 number, since 2×220101111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220101111196 and 220101111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220101111227) 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, 1550007755 + ... + 1550007896.

It is an arithmetic number, because the mean of its divisors is an integer number (55800281736).

Almost surely, 2^220101111221 is an apocalyptic number.

It is an amenable number.

220101111221 is a deficient number, since it is larger than the sum of its proper divisors (3100015723).

220101111221 is an equidigital number, since it uses as much as digits as its factorization.

220101111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100015722.

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

Adding to 220101111221 its reverse (122111101022), we get a palindrome (342212212243).

The spelling of 220101111221 in words is "two hundred twenty billion, one hundred one million, one hundred eleven thousand, two hundred twenty-one".