187120321821 has 12 divisors (see below), whose sum is σ = 276035652672. Its totient is φ = 122092691976.

The previous prime is 187120321789. The next prime is 187120321831. The reversal of 187120321821 is 128123021781.

187120321821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 187120321821 - 2⁵ = 187120321789 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187120321831) 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 11 ways as a sum of consecutive naturals, for example, 221181991 + ... + 221182836.

It is an arithmetic number, because the mean of its divisors is an integer number (23002971056).

Almost surely, 2^187120321821 is an apocalyptic number.

It is an amenable number.

187120321821 is a deficient number, since it is larger than the sum of its proper divisors (88915330851).

187120321821 is a wasteful number, since it uses less digits than its factorization.

187120321821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442364880 (or 442364877 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The spelling of 187120321821 in words is "one hundred eighty-seven billion, one hundred twenty million, three hundred twenty-one thousand, eight hundred twenty-one".