220121021222101 has 4 divisors (see below), whose sum is σ = 225489826617804. Its totient is φ = 214752215826400.

The previous prime is 220121021222077. The next prime is 220121021222159. The reversal of 220121021222101 is 101222120121022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130345377272100 + 89775643950001 = 11416890^2 + 9475001^2 .

It is a cyclic number.

It is not a de Polignac number, because 220121021222101 - 2⁹ = 220121021221589 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 (220121021222801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2684402697790 + ... + 2684402697871.

It is an arithmetic number, because the mean of its divisors is an integer number (56372456654451).

Almost surely, 2^{220121021222101} is an apocalyptic number.

It is an amenable number.

220121021222101 is a deficient number, since it is larger than the sum of its proper divisors (5368805395703).

220121021222101 is an equidigital number, since it uses as much as digits as its factorization.

220121021222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5368805395702.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 220121021222101 its reverse (101222120121022), we get a palindrome (321343141343123).

The spelling of 220121021222101 in words is "two hundred twenty trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, one hundred one".