43143040021 has 4 divisors (see below), whose sum is σ = 43750688544. Its totient is φ = 42535391500.

The previous prime is 43143040013. The next prime is 43143040067. The reversal of 43143040021 is 12004034134.

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: 12004034134 = 2 ⋅6002017067.

It is a cyclic number.

It is not a de Polignac number, because 43143040021 - 2³ = 43143040013 is a prime.

It is a super-2 number, since 2×43143040021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43143039974 and 43143040001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43143040121) 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, 303824155 + ... + 303824296.

It is an arithmetic number, because the mean of its divisors is an integer number (10937672136).

Almost surely, 2^43143040021 is an apocalyptic number.

It is an amenable number.

43143040021 is a deficient number, since it is larger than the sum of its proper divisors (607648523).

43143040021 is an equidigital number, since it uses as much as digits as its factorization.

43143040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607648522.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 43143040021 its reverse (12004034134), we get a palindrome (55147074155).

The spelling of 43143040021 in words is "forty-three billion, one hundred forty-three million, forty thousand, twenty-one".