220111001221 has 4 divisors (see below), whose sum is σ = 220213237932. Its totient is φ = 220008764512.

The previous prime is 220111001207. The next prime is 220111001251. The reversal of 220111001221 is 122100111022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122100111022 = 2 ⋅61050055511.

It can be written as a sum of positive squares in 2 ways, for example, as 30114396225 + 189996604996 = 173535^2 + 435886^2 .

It is a cyclic number.

It is not a de Polignac number, because 220111001221 - 2⁷ = 220111001093 is a prime.

It is a super-2 number, since 2×220111001221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220111001251) 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, 51115126 + ... + 51119431.

It is an arithmetic number, because the mean of its divisors is an integer number (55053309483).

Almost surely, 2^220111001221 is an apocalyptic number.

It is an amenable number.

220111001221 is a deficient number, since it is larger than the sum of its proper divisors (102236711).

220111001221 is a wasteful number, since it uses less digits than its factorization.

220111001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102236710.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 220111001221 its reverse (122100111022), we get a palindrome (342211112243).

The spelling of 220111001221 in words is "two hundred twenty billion, one hundred eleven million, one thousand, two hundred twenty-one".