121520520415 has 8 divisors (see below), whose sum is σ = 166656713760. Its totient is φ = 83328356832.

The previous prime is 121520520377. The next prime is 121520520439. The reversal of 121520520415 is 514025025121.

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

It is a de Polignac number, because none of the positive numbers 2^k-121520520415 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1736007400 + ... + 1736007469.

It is an arithmetic number, because the mean of its divisors is an integer number (20832089220).

Almost surely, 2^121520520415 is an apocalyptic number.

121520520415 is a deficient number, since it is larger than the sum of its proper divisors (45136193345).

121520520415 is an equidigital number, since it uses as much as digits as its factorization.

121520520415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3472014881.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 121520520415 its reverse (514025025121), we get a palindrome (635545545536).

The spelling of 121520520415 in words is "one hundred twenty-one billion, five hundred twenty million, five hundred twenty thousand, four hundred fifteen".