40242243421 has 4 divisors (see below), whose sum is σ = 40242721500. Its totient is φ = 40241765344.

The previous prime is 40242243397. The next prime is 40242243439. The reversal of 40242243421 is 12434224204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8374995225 + 31867248196 = 91515^2 + 178514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40242243421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40242243421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40242243491) 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, 75466 + ... + 293563.

It is an arithmetic number, because the mean of its divisors is an integer number (10060680375).

Almost surely, 2^40242243421 is an apocalyptic number.

It is an amenable number.

40242243421 is a deficient number, since it is larger than the sum of its proper divisors (478079).

40242243421 is a wasteful number, since it uses less digits than its factorization.

40242243421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478078.

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 40242243421 its reverse (12434224204), we get a palindrome (52676467625).

The spelling of 40242243421 in words is "forty billion, two hundred forty-two million, two hundred forty-three thousand, four hundred twenty-one".