43872117321 has 32 divisors (see below), whose sum is σ = 60967296000. Its totient is φ = 28031754240.

The previous prime is 43872117319. The next prime is 43872117323. The reversal of 43872117321 is 12371127834.

It is an interprime number because it is at equal distance from previous prime (43872117319) and next prime (43872117323).

It is not a de Polignac number, because 43872117321 - 2¹ = 43872117319 is a prime.

It is a super-3 number, since 3×43872117321³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43872117321.

It is not an unprimeable number, because it can be changed into a prime (43872117323) 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 31 ways as a sum of consecutive naturals, for example, 5716875 + ... + 5724543.

It is an arithmetic number, because the mean of its divisors is an integer number (1905228000).

Almost surely, 2^43872117321 is an apocalyptic number.

It is an amenable number.

43872117321 is a deficient number, since it is larger than the sum of its proper divisors (17095178679).

43872117321 is a wasteful number, since it uses less digits than its factorization.

43872117321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8289.

The product of its digits is 56448, while the sum is 39.

The spelling of 43872117321 in words is "forty-three billion, eight hundred seventy-two million, one hundred seventeen thousand, three hundred twenty-one".