220120012101221 has 4 divisors (see below), whose sum is σ = 220140566786700. Its totient is φ = 220099457415744.

The previous prime is 220120012101193. The next prime is 220120012101277. The reversal of 220120012101221 is 122101210021022.

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 203625765062500 + 16494247038721 = 14269750^2 + 4061311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220120012101221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220120012101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220120012100221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10277326676 + ... + 10277348093.

It is an arithmetic number, because the mean of its divisors is an integer number (55035141696675).

Almost surely, 2^{220120012101221} is an apocalyptic number.

It is an amenable number.

220120012101221 is a deficient number, since it is larger than the sum of its proper divisors (20554685479).

220120012101221 is a wasteful number, since it uses less digits than its factorization.

220120012101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20554685478.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 220120012101221 its reverse (122101210021022), we get a palindrome (342221222122243).

The spelling of 220120012101221 in words is "two hundred twenty trillion, one hundred twenty billion, twelve million, one hundred one thousand, two hundred twenty-one".