222121221221121 has 4 divisors (see below), whose sum is σ = 296161628294832. Its totient is φ = 148080814147412.

The previous prime is 222121221221113. The next prime is 222121221221161. The reversal of 222121221221121 is 121122122121222.

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 a cyclic number.

It is not a de Polignac number, because 222121221221121 - 2³ = 222121221221113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222121221221091 and 222121221221100.

It is not an unprimeable number, because it can be changed into a prime (222121221221161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37020203536851 + ... + 37020203536856.

It is an arithmetic number, because the mean of its divisors is an integer number (74040407073708).

Almost surely, 2^{222121221221121} is an apocalyptic number.

It is an amenable number.

222121221221121 is a deficient number, since it is larger than the sum of its proper divisors (74040407073711).

222121221221121 is an equidigital number, since it uses as much as digits as its factorization.

222121221221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74040407073710.

The product of its digits is 512, while the sum is 24.

Adding to 222121221221121 its reverse (121122122121222), we get a palindrome (343243343342343).

The spelling of 222121221221121 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".