43423121420 has 48 divisors (see below), whose sum is σ = 110345820480. Its totient is φ = 14012166144.

The previous prime is 43423121393. The next prime is 43423121453. The reversal of 43423121420 is 2412132434.

It is a self number, because there is not a number n which added to its sum of digits gives 43423121420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9120125 + ... + 9124884.

It is an arithmetic number, because the mean of its divisors is an integer number (2298871260).

Almost surely, 2^43423121420 is an apocalyptic number.

It is an amenable number.

43423121420 is an abundant number, since it is smaller than the sum of its proper divisors (66922699060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43423121420 is a wasteful number, since it uses less digits than its factorization.

43423121420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18245042 (or 18245040 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 43423121420 its reverse (2412132434), we get a palindrome (45835253854).

The spelling of 43423121420 in words is "forty-three billion, four hundred twenty-three million, one hundred twenty-one thousand, four hundred twenty".