220121212211 has 4 divisors (see below), whose sum is σ = 220127112000. Its totient is φ = 220115312424.

The previous prime is 220121212139. The next prime is 220121212219. The reversal of 220121212211 is 112212121022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112212121022 = 2 ⋅56106060511.

It is a cyclic number.

It is not a de Polignac number, because 220121212211 - 2¹⁸ = 220120950067 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 220121212211.

It is not an unprimeable number, because it can be changed into a prime (220121212219) 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, 2893571 + ... + 2968668.

It is an arithmetic number, because the mean of its divisors is an integer number (55031778000).

Almost surely, 2^220121212211 is an apocalyptic number.

220121212211 is a deficient number, since it is larger than the sum of its proper divisors (5899789).

220121212211 is an equidigital number, since it uses as much as digits as its factorization.

220121212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5899788.

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

Adding to 220121212211 its reverse (112212121022), we get a palindrome (332333333233).

The spelling of 220121212211 in words is "two hundred twenty billion, one hundred twenty-one million, two hundred twelve thousand, two hundred eleven".