220220020001221 has 4 divisors (see below), whose sum is σ = 220220059906944. Its totient is φ = 220219980095500.

The previous prime is 220220020001207. The next prime is 220220020001239. The reversal of 220220020001221 is 122100020022022.

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 220220020001221 - 2¹¹ = 220220019999173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220220020001195 and 220220020001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220220020001921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10030255 + ... + 23260396.

It is an arithmetic number, because the mean of its divisors is an integer number (55055014976736).

Almost surely, 2^{220220020001221} is an apocalyptic number.

It is an amenable number.

220220020001221 is a deficient number, since it is larger than the sum of its proper divisors (39905723).

220220020001221 is an equidigital number, since it uses as much as digits as its factorization.

220220020001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39905722.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 220220020001221 its reverse (122100020022022), we get a palindrome (342320040023243).

The spelling of 220220020001221 in words is "two hundred twenty trillion, two hundred twenty billion, twenty million, one thousand, two hundred twenty-one".