43147933921 has 4 divisors (see below), whose sum is σ = 45023931072. Its totient is φ = 41271936772.

The previous prime is 43147933861. The next prime is 43147933931. The reversal of 43147933921 is 12933974134.

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: 12933974134 = 2 ⋅6466987067.

It is a cyclic number.

It is not a de Polignac number, because 43147933921 - 2¹⁷ = 43147802849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43147933931) 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, 937998541 + ... + 937998586.

It is an arithmetic number, because the mean of its divisors is an integer number (11255982768).

Almost surely, 2^43147933921 is an apocalyptic number.

It is an amenable number.

43147933921 is a deficient number, since it is larger than the sum of its proper divisors (1875997151).

43147933921 is a wasteful number, since it uses less digits than its factorization.

43147933921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875997150.

The product of its digits is 489888, while the sum is 46.

The spelling of 43147933921 in words is "forty-three billion, one hundred forty-seven million, nine hundred thirty-three thousand, nine hundred twenty-one".