121520402121 has 8 divisors (see below), whose sum is σ = 162184058080. Its totient is φ = 80935173792.

The previous prime is 121520402117. The next prime is 121520402161. The reversal of 121520402121 is 121204025121.

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

It is not a de Polignac number, because 121520402121 - 2² = 121520402117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121520402161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19603291 + ... + 19609488.

It is an arithmetic number, because the mean of its divisors is an integer number (20273007260).

Almost surely, 2^121520402121 is an apocalyptic number.

It is an amenable number.

121520402121 is a deficient number, since it is larger than the sum of its proper divisors (40663655959).

121520402121 is a wasteful number, since it uses less digits than its factorization.

121520402121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39213815.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 121520402121 its reverse (121204025121), we get a palindrome (242724427242).

The spelling of 121520402121 in words is "one hundred twenty-one billion, five hundred twenty million, four hundred two thousand, one hundred twenty-one".