40342243421 has 4 divisors (see below), whose sum is σ = 41643606144. Its totient is φ = 39040880700.

The previous prime is 40342243393. The next prime is 40342243429. The reversal of 40342243421 is 12434224304.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40342243421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40342243429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650681315 + ... + 650681376.

It is an arithmetic number, because the mean of its divisors is an integer number (10410901536).

Almost surely, 2^40342243421 is an apocalyptic number.

It is an amenable number.

40342243421 is a deficient number, since it is larger than the sum of its proper divisors (1301362723).

40342243421 is a wasteful number, since it uses less digits than its factorization.

40342243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301362722.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 40342243421 its reverse (12434224304), we get a palindrome (52776467725).

The spelling of 40342243421 in words is "forty billion, three hundred forty-two million, two hundred forty-three thousand, four hundred twenty-one".