121100022111221 has 4 divisors (see below), whose sum is σ = 121100045735244. Its totient is φ = 121099998487200.

The previous prime is 121100022111169. The next prime is 121100022111227. The reversal of 121100022111221 is 122111220001121.

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 61858445220196 + 59241576891025 = 7865014^2 + 7696855^2 .

It is a cyclic number.

It is not a de Polignac number, because 121100022111221 - 2²⁶ = 121099955002357 is a prime.

It is a super-2 number, since 2×121100022111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121100022111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100022111227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532400 + ... + 15571881.

It is an arithmetic number, because the mean of its divisors is an integer number (30275011433811).

Almost surely, 2^{121100022111221} is an apocalyptic number.

It is an amenable number.

121100022111221 is a deficient number, since it is larger than the sum of its proper divisors (23624023).

121100022111221 is an equidigital number, since it uses as much as digits as its factorization.

121100022111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23624022.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121100022111221 its reverse (122111220001121), we get a palindrome (243211242112342).

The spelling of 121100022111221 in words is "one hundred twenty-one trillion, one hundred billion, twenty-two million, one hundred eleven thousand, two hundred twenty-one".