121405325615 has 16 divisors (see below), whose sum is σ = 168215218752. Its totient is φ = 82391122944.

The previous prime is 121405325609. The next prime is 121405325617. The reversal of 121405325615 is 516523504121.

It is a cyclic number.

It is not a de Polignac number, because 121405325615 - 2¹⁰ = 121405324591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121405325617) 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, 17876624 + ... + 17883413.

It is an arithmetic number, because the mean of its divisors is an integer number (10513451172).

Almost surely, 2^121405325615 is an apocalyptic number.

121405325615 is a deficient number, since it is larger than the sum of its proper divisors (46809893137).

121405325615 is an equidigital number, since it uses as much as digits as its factorization.

121405325615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35760146.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 121405325615 its reverse (516523504121), we get a palindrome (637928829736).

The spelling of 121405325615 in words is "one hundred twenty-one billion, four hundred five million, three hundred twenty-five thousand, six hundred fifteen".