220121022221 has 8 divisors (see below), whose sum is σ = 241780528320. Its totient is φ = 199468935072.

The previous prime is 220121022217. The next prime is 220121022239. The reversal of 220121022221 is 122220121022.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 220121022221 - 2² = 220121022217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 220121022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121022271) 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, 251854280 + ... + 251855153.

It is an arithmetic number, because the mean of its divisors is an integer number (30222566040).

Almost surely, 2^220121022221 is an apocalyptic number.

It is an amenable number.

220121022221 is a deficient number, since it is larger than the sum of its proper divisors (21659506099).

220121022221 is a wasteful number, since it uses less digits than its factorization.

220121022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503709475.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 220121022221 its reverse (122220121022), we get a palindrome (342341143243).

The spelling of 220121022221 in words is "two hundred twenty billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".