220111122121221 has 4 divisors (see below), whose sum is σ = 293481496161632. Its totient is φ = 146740748080812.

The previous prime is 220111122121213. The next prime is 220111122121243. The reversal of 220111122121221 is 122121221111022.

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 220111122121221 - 2³ = 220111122121213 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 (220111122121921) 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, 36685187020201 + ... + 36685187020206.

It is an arithmetic number, because the mean of its divisors is an integer number (73370374040408).

Almost surely, 2^{220111122121221} is an apocalyptic number.

It is an amenable number.

220111122121221 is a deficient number, since it is larger than the sum of its proper divisors (73370374040411).

220111122121221 is an equidigital number, since it uses as much as digits as its factorization.

220111122121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73370374040410.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 220111122121221 its reverse (122121221111022), we get a palindrome (342232343232243).

The spelling of 220111122121221 in words is "two hundred twenty trillion, one hundred eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".