42402344423021 has 4 divisors (see below), whose sum is σ = 46257103006944. Its totient is φ = 38547585839100.

The previous prime is 42402344423011. The next prime is 42402344423027. The reversal of 42402344423021 is 12032444320424.

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-42402344423021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42402344423027) 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, 1927379291945 + ... + 1927379291966.

It is an arithmetic number, because the mean of its divisors is an integer number (11564275751736).

Almost surely, 2^{42402344423021} is an apocalyptic number.

It is an amenable number.

42402344423021 is a deficient number, since it is larger than the sum of its proper divisors (3854758583923).

42402344423021 is a wasteful number, since it uses less digits than its factorization.

42402344423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3854758583922.

The product of its (nonzero) digits is 147456, while the sum is 35.

Adding to 42402344423021 its reverse (12032444320424), we get a palindrome (54434788743445).

The spelling of 42402344423021 in words is "forty-two trillion, four hundred two billion, three hundred forty-four million, four hundred twenty-three thousand, twenty-one".