220001121221 has 16 divisors (see below), whose sum is σ = 253081282560. Its totient is φ = 187336437120.

The previous prime is 220001121209. The next prime is 220001121227. The reversal of 220001121221 is 122121100022.

It is a de Polignac number, because none of the positive numbers 2^k-220001121221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220001121196 and 220001121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220001121227) 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, 903425 + ... + 1120793.

It is an arithmetic number, because the mean of its divisors is an integer number (15817580160).

Almost surely, 2^220001121221 is an apocalyptic number.

It is an amenable number.

220001121221 is a deficient number, since it is larger than the sum of its proper divisors (33080161339).

220001121221 is a wasteful number, since it uses less digits than its factorization.

220001121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218324.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 220001121221 its reverse (122121100022), we get a palindrome (342122221243).

The spelling of 220001121221 in words is "two hundred twenty billion, one million, one hundred twenty-one thousand, two hundred twenty-one".