121102122221 has 4 divisors (see below), whose sum is σ = 125278057500. Its totient is φ = 116926186944.

The previous prime is 121102122217. The next prime is 121102122223. The reversal of 121102122221 is 122221201121.

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 92485324996 + 28616797225 = 304114^2 + 169165^2 .

It is a cyclic number.

It is not a de Polignac number, because 121102122221 - 2² = 121102122217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121102122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121102122223) 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 3 ways as a sum of consecutive naturals, for example, 2087967596 + ... + 2087967653.

It is an arithmetic number, because the mean of its divisors is an integer number (31319514375).

Almost surely, 2^121102122221 is an apocalyptic number.

It is an amenable number.

121102122221 is a deficient number, since it is larger than the sum of its proper divisors (4175935279).

121102122221 is an equidigital number, since it uses as much as digits as its factorization.

121102122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4175935278.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121102122221 its reverse (122221201121), we get a palindrome (243323323342).

The spelling of 121102122221 in words is "one hundred twenty-one billion, one hundred two million, one hundred twenty-two thousand, two hundred twenty-one".