220122212221 has 8 divisors (see below), whose sum is σ = 221276722040. Its totient is φ = 218967846912.

The previous prime is 220122212203. The next prime is 220122212269. The reversal of 220122212221 is 122212221022.

It can be written as a sum of positive squares in 4 ways, for example, as 87385863321 + 132736348900 = 295611^2 + 364330^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220122212221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220122212281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4505995 + ... + 4554583.

It is an arithmetic number, because the mean of its divisors is an integer number (27659590255).

Almost surely, 2^220122212221 is an apocalyptic number.

It is an amenable number.

220122212221 is a deficient number, since it is larger than the sum of its proper divisors (1154509819).

220122212221 is a wasteful number, since it uses less digits than its factorization.

220122212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72255.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 220122212221 its reverse (122212221022), we get a palindrome (342334433243).

The spelling of 220122212221 in words is "two hundred twenty billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".