2187868335121 has 4 divisors (see below), whose sum is σ = 2500420954432. Its totient is φ = 1875315715812.

The previous prime is 2187868335089. The next prime is 2187868335193. The reversal of 2187868335121 is 1215338687812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2187868335121 - 2⁵ = 2187868335089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2187868338121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156276309645 + ... + 156276309658.

It is an arithmetic number, because the mean of its divisors is an integer number (625105238608).

Almost surely, 2^{2187868335121} is an apocalyptic number.

It is an amenable number.

2187868335121 is a deficient number, since it is larger than the sum of its proper divisors (312552619311).

2187868335121 is an equidigital number, since it uses as much as digits as its factorization.

2187868335121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312552619310.

The product of its digits is 3870720, while the sum is 55.

The spelling of 2187868335121 in words is "two trillion, one hundred eighty-seven billion, eight hundred sixty-eight million, three hundred thirty-five thousand, one hundred twenty-one".