220200001221221 has 4 divisors (see below), whose sum is σ = 251657144252832. Its totient is φ = 188742858189612.

The previous prime is 220200001221163. The next prime is 220200001221241. The reversal of 220200001221221 is 122122100002022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220200001221221 - 2¹⁸ = 220200000959077 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 220200001221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220200001221241) 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, 15728571515795 + ... + 15728571515808.

It is an arithmetic number, because the mean of its divisors is an integer number (62914286063208).

Almost surely, 2^{220200001221221} is an apocalyptic number.

It is an amenable number.

220200001221221 is a deficient number, since it is larger than the sum of its proper divisors (31457143031611).

220200001221221 is an equidigital number, since it uses as much as digits as its factorization.

220200001221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31457143031610.

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

Adding to 220200001221221 its reverse (122122100002022), we get a palindrome (342322101223243).

The spelling of 220200001221221 in words is "two hundred twenty trillion, two hundred billion, one million, two hundred twenty-one thousand, two hundred twenty-one".