121110102222221 has 12 divisors (see below), whose sum is σ = 140887832547132. Its totient is φ = 103805230955328.

The previous prime is 121110102222173. The next prime is 121110102222371. The reversal of 121110102222221 is 122222201011121.

It can be written as a sum of positive squares in 2 ways, for example, as 33984399388996 + 87125702833225 = 5829614^2 + 9334115^2 .

It is not a de Polignac number, because 121110102222221 - 2³⁸ = 120835224315277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121110102222193 and 121110102222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121110102222521) 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 11 ways as a sum of consecutive naturals, for example, 39311120 + ... + 42279833.

It is an arithmetic number, because the mean of its divisors is an integer number (11740652712261).

Almost surely, 2^{121110102222221} is an apocalyptic number.

It is an amenable number.

121110102222221 is a deficient number, since it is larger than the sum of its proper divisors (19777730324911).

121110102222221 is an equidigital number, since it uses as much as digits as its factorization.

121110102222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81621260 (or 81621253 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121110102222221 its reverse (122222201011121), we get a palindrome (243332303233342).

The spelling of 121110102222221 in words is "one hundred twenty-one trillion, one hundred ten billion, one hundred two million, two hundred twenty-two thousand, two hundred twenty-one".