43202421523 has 4 divisors (see below), whose sum is σ = 43205053360. Its totient is φ = 43199789688.

The previous prime is 43202421491. The next prime is 43202421527. The reversal of 43202421523 is 32512420234.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43202421523 - 2⁵ = 43202421491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43202421491 and 43202421500.

It is not an unprimeable number, because it can be changed into a prime (43202421527) 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, 1291140 + ... + 1324177.

It is an arithmetic number, because the mean of its divisors is an integer number (10801263340).

Almost surely, 2^43202421523 is an apocalyptic number.

43202421523 is a deficient number, since it is larger than the sum of its proper divisors (2631837).

43202421523 is a wasteful number, since it uses less digits than its factorization.

43202421523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631836.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 43202421523 its reverse (32512420234), we get a palindrome (75714841757).

The spelling of 43202421523 in words is "forty-three billion, two hundred two million, four hundred twenty-one thousand, five hundred twenty-three".