42440021123321 has 4 divisors (see below), whose sum is σ = 42440505459444. Its totient is φ = 42439536787200.

The previous prime is 42440021123287. The next prime is 42440021123327. The reversal of 42440021123321 is 12332112004424.

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 41726690544400 + 713330578921 = 6459620^2 + 844589^2 .

It is a cyclic number.

It is not a de Polignac number, because 42440021123321 - 2²⁶ = 42439954014457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42440021123327) 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, 242036600 + ... + 242211881.

It is an arithmetic number, because the mean of its divisors is an integer number (10610126364861).

Almost surely, 2^{42440021123321} is an apocalyptic number.

It is an amenable number.

42440021123321 is a deficient number, since it is larger than the sum of its proper divisors (484336123).

42440021123321 is an equidigital number, since it uses as much as digits as its factorization.

42440021123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484336122.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 42440021123321 its reverse (12332112004424), we get a palindrome (54772133127745).

The spelling of 42440021123321 in words is "forty-two trillion, four hundred forty billion, twenty-one million, one hundred twenty-three thousand, three hundred twenty-one".