220012122211221 has 4 divisors (see below), whose sum is σ = 293349496281632. Its totient is φ = 146674748140812.

The previous prime is 220012122211181. The next prime is 220012122211237. The reversal of 220012122211221 is 122112221210022.

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 not a de Polignac number, because 220012122211221 - 2¹⁸ = 220012121949077 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 (220012122211121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36668687035201 + ... + 36668687035206.

It is an arithmetic number, because the mean of its divisors is an integer number (73337374070408).

Almost surely, 2^{220012122211221} is an apocalyptic number.

It is an amenable number.

220012122211221 is a deficient number, since it is larger than the sum of its proper divisors (73337374070411).

220012122211221 is an equidigital number, since it uses as much as digits as its factorization.

220012122211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73337374070410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 220012122211221 its reverse (122112221210022), we get a palindrome (342124343421243).

The spelling of 220012122211221 in words is "two hundred twenty trillion, twelve billion, one hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".