21022212220121 has 16 divisors (see below), whose sum is σ = 24031220724864. Its totient is φ = 18014663140224.

The previous prime is 21022212220099. The next prime is 21022212220157. The reversal of 21022212220121 is 12102221222012.

It is a cyclic number.

It is not a de Polignac number, because 21022212220121 - 2¹⁰ = 21022212219097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022212220093 and 21022212220102.

It is not an unprimeable number, because it can be changed into a prime (21022212220921) 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, 843473966 + ... + 843498888.

It is an arithmetic number, because the mean of its divisors is an integer number (1501951295304).

Almost surely, 2^{21022212220121} is an apocalyptic number.

It is an amenable number.

21022212220121 is a deficient number, since it is larger than the sum of its proper divisors (3009008504743).

21022212220121 is a wasteful number, since it uses less digits than its factorization.

21022212220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49360.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21022212220121 its reverse (12102221222012), we get a palindrome (33124433442133).

The spelling of 21022212220121 in words is "twenty-one trillion, twenty-two billion, two hundred twelve million, two hundred twenty thousand, one hundred twenty-one".