442455430040021 has 4 divisors (see below), whose sum is σ = 443324694146700. Its totient is φ = 441586165933344.

The previous prime is 442455430039993. The next prime is 442455430040053. The reversal of 442455430040021 is 120040034554244.

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 278229539085796 + 164225890954225 = 16680214^2 + 12815065^2 .

It is a cyclic number.

It is not a de Polignac number, because 442455430040021 - 2²² = 442455425845717 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 (442455430040521) 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, 434632052576 + ... + 434632053593.

It is an arithmetic number, because the mean of its divisors is an integer number (110831173536675).

Almost surely, 2^{442455430040021} is an apocalyptic number.

It is an amenable number.

442455430040021 is a deficient number, since it is larger than the sum of its proper divisors (869264106679).

442455430040021 is an equidigital number, since it uses as much as digits as its factorization.

442455430040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869264106678.

The product of its (nonzero) digits is 307200, while the sum is 38.

Adding to 442455430040021 its reverse (120040034554244), we get a palindrome (562495464594265).

The spelling of 442455430040021 in words is "four hundred forty-two trillion, four hundred fifty-five billion, four hundred thirty million, forty thousand, twenty-one".