121513505215 has 8 divisors (see below), whose sum is σ = 145825933968. Its totient is φ = 97204319040.

The previous prime is 121513505213. The next prime is 121513505219. The reversal of 121513505215 is 512505315121.

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

It is not a de Polignac number, because 121513505215 - 2¹ = 121513505213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121513505213) 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, 727422 + ... + 878731.

It is an arithmetic number, because the mean of its divisors is an integer number (18228241746).

Almost surely, 2^121513505215 is an apocalyptic number.

121513505215 is a deficient number, since it is larger than the sum of its proper divisors (24312428753).

121513505215 is a wasteful number, since it uses less digits than its factorization.

121513505215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621289.

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 121513505215 in words is "one hundred twenty-one billion, five hundred thirteen million, five hundred five thousand, two hundred fifteen".