43123444021 has 8 divisors (see below), whose sum is σ = 49978076544. Its totient is φ = 36442346640.

The previous prime is 43123444003. The next prime is 43123444057. The reversal of 43123444021 is 12044432134.

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

It is not a de Polignac number, because 43123444021 - 2⁵ = 43123443989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43123444121) 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, 43383250 + ... + 43384243.

It is an arithmetic number, because the mean of its divisors is an integer number (6247259568).

Almost surely, 2^43123444021 is an apocalyptic number.

It is an amenable number.

43123444021 is a deficient number, since it is larger than the sum of its proper divisors (6854632523).

43123444021 is an equidigital number, since it uses as much as digits as its factorization.

43123444021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86767571.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 43123444021 its reverse (12044432134), we get a palindrome (55167876155).

The spelling of 43123444021 in words is "forty-three billion, one hundred twenty-three million, four hundred forty-four thousand, twenty-one".