1875231920821 has 4 divisors (see below), whose sum is σ = 2143122195232. Its totient is φ = 1607341646412.

The previous prime is 1875231920813. The next prime is 1875231920851. The reversal of 1875231920821 is 1280291325781.

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 a cyclic number.

It is not a de Polignac number, because 1875231920821 - 2³ = 1875231920813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1875231920851) 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 3 ways as a sum of consecutive naturals, for example, 133945137195 + ... + 133945137208.

It is an arithmetic number, because the mean of its divisors is an integer number (535780548808).

Almost surely, 2^{1875231920821} is an apocalyptic number.

It is an amenable number.

1875231920821 is a deficient number, since it is larger than the sum of its proper divisors (267890274411).

1875231920821 is an equidigital number, since it uses as much as digits as its factorization.

1875231920821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267890274410.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 1875231920821 in words is "one trillion, eight hundred seventy-five billion, two hundred thirty-one million, nine hundred twenty thousand, eight hundred twenty-one".