2387856364921 has 8 divisors (see below), whose sum is σ = 2528552003400. Its totient is φ = 2247186670848.

The previous prime is 2387856364913. The next prime is 2387856364939. The reversal of 2387856364921 is 1294636587832.

It can be written as a sum of positive squares in 4 ways, for example, as 738843393600 + 1649012971321 = 859560^2 + 1284139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2387856364921 - 2³ = 2387856364913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2387856364951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6296446 + ... + 6664903.

It is an arithmetic number, because the mean of its divisors is an integer number (316069000425).

Almost surely, 2^{2387856364921} is an apocalyptic number.

It is an amenable number.

2387856364921 is a deficient number, since it is larger than the sum of its proper divisors (140695638479).

2387856364921 is a wasteful number, since it uses less digits than its factorization.

2387856364921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12972203.

The product of its digits is 104509440, while the sum is 64.

The spelling of 2387856364921 in words is "two trillion, three hundred eighty-seven billion, eight hundred fifty-six million, three hundred sixty-four thousand, nine hundred twenty-one".