43423121421 has 12 divisors (see below), whose sum is σ = 62749041472. Its totient is φ = 28936399176.

The previous prime is 43423121393. The next prime is 43423121453. The reversal of 43423121421 is 12412132434.

43423121421 is a `hidden beast` number, since 4 + 3 + 4 + 231 + 2 + 1 + 421 = 666.

It is not a de Polignac number, because 43423121421 - 2²² = 43418927117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43423121461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1006741 + ... + 1048986.

Almost surely, 2^43423121421 is an apocalyptic number.

It is an amenable number.

43423121421 is a deficient number, since it is larger than the sum of its proper divisors (19325920051).

43423121421 is a wasteful number, since it uses less digits than its factorization.

43423121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058080 (or 2058077 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 43423121421 its reverse (12412132434), we get a palindrome (55835253855).

The spelling of 43423121421 in words is "forty-three billion, four hundred twenty-three million, one hundred twenty-one thousand, four hundred twenty-one".