121513210512455 has 16 divisors (see below), whose sum is σ = 145846726968000. Its totient is φ = 97189987138560.

The previous prime is 121513210512439. The next prime is 121513210512481. The reversal of 121513210512455 is 554215012315121.

It is not a de Polignac number, because 121513210512455 - 2⁴ = 121513210512439 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 (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 693239525 + ... + 693414785.

It is an arithmetic number, because the mean of its divisors is an integer number (9115420435500).

Almost surely, 2^{121513210512455} is an apocalyptic number.

121513210512455 is a deficient number, since it is larger than the sum of its proper divisors (24333516455545).

121513210512455 is a wasteful number, since it uses less digits than its factorization.

121513210512455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203834.

The product of its (nonzero) digits is 60000, while the sum is 38.

Adding to 121513210512455 its reverse (554215012315121), we get a palindrome (675728222827576).

The spelling of 121513210512455 in words is "one hundred twenty-one trillion, five hundred thirteen billion, two hundred ten million, five hundred twelve thousand, four hundred fifty-five".