43997221915 has 8 divisors (see below), whose sum is σ = 52852778928. Its totient is φ = 35160369120.

The previous prime is 43997221897. The next prime is 43997221927. The reversal of 43997221915 is 51912279934.

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

It is not a de Polignac number, because 43997221915 - 2¹³ = 43997213723 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4670877 + ... + 4680286.

It is an arithmetic number, because the mean of its divisors is an integer number (6606597366).

Almost surely, 2^43997221915 is an apocalyptic number.

43997221915 is a deficient number, since it is larger than the sum of its proper divisors (8855557013).

43997221915 is an equidigital number, since it uses as much as digits as its factorization.

43997221915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9352109.

The product of its digits is 1224720, while the sum is 52.

The spelling of 43997221915 in words is "forty-three billion, nine hundred ninety-seven million, two hundred twenty-one thousand, nine hundred fifteen".