11878500394121 has 4 divisors (see below), whose sum is σ = 11882517475332. Its totient is φ = 11874483312912.

The previous prime is 11878500394109. The next prime is 11878500394127. The reversal of 11878500394121 is 12149300587811.

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 1703453066896 + 10175047327225 = 1305164^2 + 3189835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11878500394121 is a prime.

It is a super-2 number, since 2×11878500394121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11878500394121.

It is not an unprimeable number, because it can be changed into a prime (11878500394127) 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, 2008536170 + ... + 2008542083.

It is an arithmetic number, because the mean of its divisors is an integer number (2970629368833).

Almost surely, 2^{11878500394121} is an apocalyptic number.

It is an amenable number.

11878500394121 is a deficient number, since it is larger than the sum of its proper divisors (4017081211).

11878500394121 is an equidigital number, since it uses as much as digits as its factorization.

11878500394121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017081210.

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 11878500394121 in words is "eleven trillion, eight hundred seventy-eight billion, five hundred million, three hundred ninety-four thousand, one hundred twenty-one".