222121110021121 has 4 divisors (see below), whose sum is σ = 222129937336752. Its totient is φ = 222112282705492.

The previous prime is 222121110021089. The next prime is 222121110021127. The reversal of 222121110021121 is 121120011121222.

It is a happy number.

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 222121110021121 - 2⁵ = 222121110021089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222121110021127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4413620071 + ... + 4413670396.

It is an arithmetic number, because the mean of its divisors is an integer number (55532484334188).

Almost surely, 2^{222121110021121} is an apocalyptic number.

It is an amenable number.

222121110021121 is a deficient number, since it is larger than the sum of its proper divisors (8827315631).

222121110021121 is an equidigital number, since it uses as much as digits as its factorization.

222121110021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8827315630.

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

Adding to 222121110021121 its reverse (121120011121222), we get a palindrome (343241121142343).

The spelling of 222121110021121 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred ten million, twenty-one thousand, one hundred twenty-one".