121121121111121 has 8 divisors (see below), whose sum is σ = 122311278995400. Its totient is φ = 119933038482432.

The previous prime is 121121121111119. The next prime is 121121121111127. The reversal of 121121121111121 is 121111121121121.

It can be written as a sum of positive squares in 4 ways, for example, as 7518777877521 + 113602343233600 = 2742039^2 + 10658440^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121121121111121 - 2¹ = 121121121111119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121121121111127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518696596 + ... + 518930053.

It is an arithmetic number, because the mean of its divisors is an integer number (15288909874425).

Almost surely, 2^{121121121111121} is an apocalyptic number.

It is an amenable number.

121121121111121 is a deficient number, since it is larger than the sum of its proper divisors (1190157884279).

121121121111121 is a wasteful number, since it uses less digits than its factorization.

121121121111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037627795.

The product of its digits is 16, while the sum is 19.

Adding to 121121121111121 its reverse (121111121121121), we get a palindrome (242232242232242).

The spelling of 121121121111121 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".