22220221022121 has 4 divisors (see below), whose sum is σ = 29626961362832. Its totient is φ = 14813480681412.

The previous prime is 22220221022081. The next prime is 22220221022141. The reversal of 22220221022121 is 12122012202222.

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 22220221022121 - 2¹⁹ = 22220220497833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22220221022141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3703370170351 + ... + 3703370170356.

It is an arithmetic number, because the mean of its divisors is an integer number (7406740340708).

Almost surely, 2^{22220221022121} is an apocalyptic number.

It is an amenable number.

22220221022121 is a deficient number, since it is larger than the sum of its proper divisors (7406740340711).

22220221022121 is an equidigital number, since it uses as much as digits as its factorization.

22220221022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7406740340710.

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

Adding to 22220221022121 its reverse (12122012202222), we get a palindrome (34342233224343).

The spelling of 22220221022121 in words is "twenty-two trillion, two hundred twenty billion, two hundred twenty-one million, twenty-two thousand, one hundred twenty-one".