121655600115 has 16 divisors (see below), whose sum is σ = 222455954688. Its totient is φ = 55613988576.

The previous prime is 121655600111. The next prime is 121655600123. The reversal of 121655600115 is 511006556121.

It is not a de Polignac number, because 121655600115 - 2² = 121655600111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121655600111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579312277 + ... + 579312486.

It is an arithmetic number, because the mean of its divisors is an integer number (13903497168).

Almost surely, 2^121655600115 is an apocalyptic number.

121655600115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121655600115 is a deficient number, since it is larger than the sum of its proper divisors (100800354573).

121655600115 is a wasteful number, since it uses less digits than its factorization.

121655600115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158624778.

The product of its (nonzero) digits is 9000, while the sum is 33.

The spelling of 121655600115 in words is "one hundred twenty-one billion, six hundred fifty-five million, six hundred thousand, one hundred fifteen".