121121220121 has 16 divisors (see below), whose sum is σ = 139273943040. Its totient is φ = 104174395920.

The previous prime is 121121220109. The next prime is 121121220127. The reversal of 121121220121 is 121022121121.

It is a cyclic number.

It is not a de Polignac number, because 121121220121 - 2⁷ = 121121219993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121121220095 and 121121220104.

It is not an unprimeable number, because it can be changed into a prime (121121220127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234705 + ... + 545278.

It is an arithmetic number, because the mean of its divisors is an integer number (8704621440).

Almost surely, 2^121121220121 is an apocalyptic number.

121121220121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121121220121 is a deficient number, since it is larger than the sum of its proper divisors (18152722919).

121121220121 is a wasteful number, since it uses less digits than its factorization.

121121220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780756.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121121220121 its reverse (121022121121), we get a palindrome (242143341242).

The spelling of 121121220121 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twenty-one".