121355331015 has 16 divisors (see below), whose sum is σ = 204387926400. Its totient is φ = 61316377632.

The previous prime is 121355330983. The next prime is 121355331029. The reversal of 121355331015 is 510133553121.

It is not a de Polignac number, because 121355331015 - 2⁵ = 121355330983 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 212903805 + ... + 212904374.

It is an arithmetic number, because the mean of its divisors is an integer number (12774245400).

Almost surely, 2^121355331015 is an apocalyptic number.

121355331015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121355331015 is a deficient number, since it is larger than the sum of its proper divisors (83032595385).

121355331015 is a wasteful number, since it uses less digits than its factorization.

121355331015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425808206.

The product of its (nonzero) digits is 6750, while the sum is 30.

Adding to 121355331015 its reverse (510133553121), we get a palindrome (631488884136).

The spelling of 121355331015 in words is "one hundred twenty-one billion, three hundred fifty-five million, three hundred thirty-one thousand, fifteen".