21222220220121 has 8 divisors (see below), whose sum is σ = 28296502603264. Its totient is φ = 14148042325200.

The previous prime is 21222220220099. The next prime is 21222220220129. The reversal of 21222220220121 is 12102202222212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21222220220121 - 2⁹ = 21222220219609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222220220129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25646905 + ... + 26461446.

It is an arithmetic number, because the mean of its divisors is an integer number (3537062825408).

Almost surely, 2^{21222220220121} is an apocalyptic number.

It is an amenable number.

21222220220121 is a deficient number, since it is larger than the sum of its proper divisors (7074282383143).

21222220220121 is a wasteful number, since it uses less digits than its factorization.

21222220220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52244111.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21222220220121 its reverse (12102202222212), we get a palindrome (33324422442333).

The spelling of 21222220220121 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty million, two hundred twenty thousand, one hundred twenty-one".