121112561265 has 16 divisors (see below), whose sum is σ = 200031069696. Its totient is φ = 62509708800.

The previous prime is 121112561263. The next prime is 121112561281. The reversal of 121112561265 is 562165211121.

It is a happy number.

It is not a de Polignac number, because 121112561265 - 2¹ = 121112561263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121112561263) by changing a digit.

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, 130228096 + ... + 130229025.

It is an arithmetic number, because the mean of its divisors is an integer number (12501941856).

Almost surely, 2^121112561265 is an apocalyptic number.

121112561265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121112561265 is a deficient number, since it is larger than the sum of its proper divisors (78918508431).

121112561265 is a wasteful number, since it uses less digits than its factorization.

121112561265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260457160.

The product of its digits is 7200, while the sum is 33.

Adding to 121112561265 its reverse (562165211121), we get a palindrome (683277772386).

The spelling of 121112561265 in words is "one hundred twenty-one billion, one hundred twelve million, five hundred sixty-one thousand, two hundred sixty-five".