121112012222221 has 4 divisors (see below), whose sum is σ = 121112105264092. Its totient is φ = 121111919180352.

The previous prime is 121112012222189. The next prime is 121112012222261. The reversal of 121112012222221 is 122222210211121.

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 11304960421225 + 109807051800996 = 3362285^2 + 10478886^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112012222221 - 2⁵ = 121112012222189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121112012222192 and 121112012222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112012222261) 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, 44540286 + ... + 47181151.

It is an arithmetic number, because the mean of its divisors is an integer number (30278026316023).

Almost surely, 2^{121112012222221} is an apocalyptic number.

It is an amenable number.

121112012222221 is a deficient number, since it is larger than the sum of its proper divisors (93041871).

121112012222221 is an equidigital number, since it uses as much as digits as its factorization.

121112012222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93041870.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 121112012222221 its reverse (122222210211121), we get a palindrome (243334222433342).

The spelling of 121112012222221 in words is "one hundred twenty-one trillion, one hundred twelve billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".