43222813921 has 4 divisors (see below), whose sum is σ = 49397501632. Its totient is φ = 37048126212.

The previous prime is 43222813901. The next prime is 43222813927. The reversal of 43222813921 is 12931822234.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12931822234 = 2 ⋅6465911117.

It is a cyclic number.

It is not a de Polignac number, because 43222813921 - 2⁷ = 43222813793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43222813927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3087343845 + ... + 3087343858.

It is an arithmetic number, because the mean of its divisors is an integer number (12349375408).

Almost surely, 2^43222813921 is an apocalyptic number.

It is an amenable number.

43222813921 is a deficient number, since it is larger than the sum of its proper divisors (6174687711).

43222813921 is an equidigital number, since it uses as much as digits as its factorization.

43222813921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6174687710.

The product of its digits is 41472, while the sum is 37.

The spelling of 43222813921 in words is "forty-three billion, two hundred twenty-two million, eight hundred thirteen thousand, nine hundred twenty-one".