42043320401 has 4 divisors (see below), whose sum is σ = 43493090100. Its totient is φ = 40593550704.

The previous prime is 42043320379. The next prime is 42043320427. The reversal of 42043320401 is 10402334024.

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 15839481025 + 26203839376 = 125855^2 + 161876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42043320401 is a prime.

It is a super-2 number, since 2×42043320401² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42043320461) 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, 724884806 + ... + 724884863.

It is an arithmetic number, because the mean of its divisors is an integer number (10873272525).

Almost surely, 2^42043320401 is an apocalyptic number.

It is an amenable number.

42043320401 is a deficient number, since it is larger than the sum of its proper divisors (1449769699).

42043320401 is a wasteful number, since it uses less digits than its factorization.

42043320401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449769698.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 42043320401 its reverse (10402334024), we get a palindrome (52445654425).

The spelling of 42043320401 in words is "forty-two billion, forty-three million, three hundred twenty thousand, four hundred one".