121515455103 has 48 divisors (see below), whose sum is σ = 197882513280. Its totient is φ = 66042212544.

The previous prime is 121515455081. The next prime is 121515455107. The reversal of 121515455103 is 301554515121.

It is a happy number.

It is not a de Polignac number, because 121515455103 - 2⁵ = 121515455071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121515455107) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72900 + ... + 498342.

It is an arithmetic number, because the mean of its divisors is an integer number (4122552360).

Almost surely, 2^121515455103 is an apocalyptic number.

121515455103 is a deficient number, since it is larger than the sum of its proper divisors (76367058177).

121515455103 is a wasteful number, since it uses less digits than its factorization.

121515455103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425556 (or 425549 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 33.

The spelling of 121515455103 in words is "one hundred twenty-one billion, five hundred fifteen million, four hundred fifty-five thousand, one hundred three".