115530125512121 has 4 divisors (see below), whose sum is σ = 116828216810100. Its totient is φ = 114232034214144.

The previous prime is 115530125512117. The next prime is 115530125512127. The reversal of 115530125512121 is 121215521035511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49926038378896 + 65604087133225 = 7065836^2 + 8099635^2 .

It is a cyclic number.

It is not a de Polignac number, because 115530125512121 - 2² = 115530125512117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115530125512127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649045648856 + ... + 649045649033.

It is an arithmetic number, because the mean of its divisors is an integer number (29207054202525).

Almost surely, 2^{115530125512121} is an apocalyptic number.

It is an amenable number.

115530125512121 is a deficient number, since it is larger than the sum of its proper divisors (1298091297979).

115530125512121 is an equidigital number, since it uses as much as digits as its factorization.

115530125512121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298091297978.

The product of its (nonzero) digits is 15000, while the sum is 35.

Adding to 115530125512121 its reverse (121215521035511), we get a palindrome (236745646547632).

The spelling of 115530125512121 in words is "one hundred fifteen trillion, five hundred thirty billion, one hundred twenty-five million, five hundred twelve thousand, one hundred twenty-one".