220200101221 has 4 divisors (see below), whose sum is σ = 220202901100. Its totient is φ = 220197301344.

The previous prime is 220200101207. The next prime is 220200101279. The reversal of 220200101221 is 122101002022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122101002022 = 2 ⋅61050501011.

It can be written as a sum of positive squares in 2 ways, for example, as 197237244996 + 22962856225 = 444114^2 + 151535^2 .

It is a cyclic number.

It is not a de Polignac number, because 220200101221 - 2²³ = 220191712613 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 (220200101291) 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, 1278456 + ... + 1440433.

It is an arithmetic number, because the mean of its divisors is an integer number (55050725275).

Almost surely, 2^220200101221 is an apocalyptic number.

It is an amenable number.

220200101221 is a deficient number, since it is larger than the sum of its proper divisors (2799879).

220200101221 is an equidigital number, since it uses as much as digits as its factorization.

220200101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799878.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 220200101221 its reverse (122101002022), we get a palindrome (342301103243).

The spelling of 220200101221 in words is "two hundred twenty billion, two hundred million, one hundred one thousand, two hundred twenty-one".