121100442121 has 4 divisors (see below), whose sum is σ = 121984387092. Its totient is φ = 120216497152.

The previous prime is 121100442049. The next prime is 121100442149. The reversal of 121100442121 is 121244001121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121244001121 = 11503 ⋅10540207.

It can be written as a sum of positive squares in 2 ways, for example, as 52697793600 + 68402648521 = 229560^2 + 261539^2 .

It is a cyclic number.

It is not a de Polignac number, because 121100442121 - 2⁷ = 121100441993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121100442181) 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, 441972280 + ... + 441972553.

It is an arithmetic number, because the mean of its divisors is an integer number (30496096773).

Almost surely, 2^121100442121 is an apocalyptic number.

It is an amenable number.

121100442121 is a deficient number, since it is larger than the sum of its proper divisors (883944971).

121100442121 is an equidigital number, since it uses as much as digits as its factorization.

121100442121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883944970.

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

Adding to 121100442121 its reverse (121244001121), we get a palindrome (242344443242).

The spelling of 121100442121 in words is "one hundred twenty-one billion, one hundred million, four hundred forty-two thousand, one hundred twenty-one".