220120201101221 has 8 divisors (see below), whose sum is σ = 220921587246360. Its totient is φ = 219320022774528.

The previous prime is 220120201101181. The next prime is 220120201101247. The reversal of 220120201101221 is 122101102021022.

It can be written as a sum of positive squares in 4 ways, for example, as 23657620488100 + 196462580613121 = 4863910^2 + 14016511^2 .

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-220120201101221 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 220120201101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220120201101721) 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, 301589456 + ... + 302318441.

It is an arithmetic number, because the mean of its divisors is an integer number (27615198405795).

Almost surely, 2^{220120201101221} is an apocalyptic number.

It is an amenable number.

220120201101221 is a deficient number, since it is larger than the sum of its proper divisors (801386145139).

220120201101221 is an equidigital number, since it uses as much as digits as its factorization.

220120201101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603909223.

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

Adding to 220120201101221 its reverse (122101102021022), we get a palindrome (342221303122243).

The spelling of 220120201101221 in words is "two hundred twenty trillion, one hundred twenty billion, two hundred one million, one hundred one thousand, two hundred twenty-one".