222220111020121 has 4 divisors (see below), whose sum is σ = 222566788261044. Its totient is φ = 221873433779200.

The previous prime is 222220111020107. The next prime is 222220111020161. The reversal of 222220111020121 is 121020111022222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111865821368896 + 110354289651225 = 10576664^2 + 10504965^2 .

It is a cyclic number.

It is not a de Polignac number, because 222220111020121 - 2³⁷ = 222082672066649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222220111020161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173338619500 + ... + 173338620781.

It is an arithmetic number, because the mean of its divisors is an integer number (55641697065261).

Almost surely, 2^{222220111020121} is an apocalyptic number.

It is an amenable number.

222220111020121 is a deficient number, since it is larger than the sum of its proper divisors (346677240923).

222220111020121 is an equidigital number, since it uses as much as digits as its factorization.

222220111020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346677240922.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 222220111020121 its reverse (121020111022222), we get a palindrome (343240222042343).

The spelling of 222220111020121 in words is "two hundred twenty-two trillion, two hundred twenty billion, one hundred eleven million, twenty thousand, one hundred twenty-one".