43443262421 has 4 divisors (see below), whose sum is σ = 46785051852. Its totient is φ = 40101472992.

The previous prime is 43443262417. The next prime is 43443262433. The reversal of 43443262421 is 12426234434.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19040136196 + 24403126225 = 137986^2 + 156215^2 .

It is a cyclic number.

It is not a de Polignac number, because 43443262421 - 2² = 43443262417 is a prime.

It is a super-3 number, since 3×43443262421³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43443262021) 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, 1670894696 + ... + 1670894721.

It is an arithmetic number, because the mean of its divisors is an integer number (11696262963).

Almost surely, 2^43443262421 is an apocalyptic number.

It is an amenable number.

43443262421 is a deficient number, since it is larger than the sum of its proper divisors (3341789431).

43443262421 is a wasteful number, since it uses less digits than its factorization.

43443262421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341789430.

The product of its digits is 110592, while the sum is 35.

Adding to 43443262421 its reverse (12426234434), we get a palindrome (55869496855).

The spelling of 43443262421 in words is "forty-three billion, four hundred forty-three million, two hundred sixty-two thousand, four hundred twenty-one".