220121101211221 has 16 divisors (see below), whose sum is σ = 251663449130368. Its totient is φ = 188602885598400.

The previous prime is 220121101211191. The next prime is 220121101211237. The reversal of 220121101211221 is 122112101121022.

It is a happy number.

It is not a de Polignac number, because 220121101211221 - 2⁵ = 220121101211189 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 (220121101211521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201174391 + ... + 202265611.

It is an arithmetic number, because the mean of its divisors is an integer number (15728965570648).

Almost surely, 2^{220121101211221} is an apocalyptic number.

It is an amenable number.

220121101211221 is a deficient number, since it is larger than the sum of its proper divisors (31542347919147).

220121101211221 is a wasteful number, since it uses less digits than its factorization.

220121101211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102252.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 220121101211221 its reverse (122112101121022), we get a palindrome (342233202332243).

The spelling of 220121101211221 in words is "two hundred twenty trillion, one hundred twenty-one billion, one hundred one million, two hundred eleven thousand, two hundred twenty-one".