42440403421 has 4 divisors (see below), whose sum is σ = 45705049852. Its totient is φ = 39175756992.

The previous prime is 42440403407. The next prime is 42440403433. The reversal of 42440403421 is 12430404424.

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 27361791396 + 15078612025 = 165414^2 + 122795^2 .

It is a cyclic number.

It is not a de Polignac number, because 42440403421 - 2⁷ = 42440403293 is a prime.

It is a super-4 number, since 4×42440403421⁴ (a number of 44 digits) contains 4444 as substring.

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 42440403421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42440403451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1632323196 + ... + 1632323221.

It is an arithmetic number, because the mean of its divisors is an integer number (11426262463).

Almost surely, 2^42440403421 is an apocalyptic number.

It is an amenable number.

42440403421 is a deficient number, since it is larger than the sum of its proper divisors (3264646431).

42440403421 is a wasteful number, since it uses less digits than its factorization.

42440403421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264646430.

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

Adding to 42440403421 its reverse (12430404424), we get a palindrome (54870807845).

The spelling of 42440403421 in words is "forty-two billion, four hundred forty million, four hundred three thousand, four hundred twenty-one".