442002305021 has 2 divisors, whose sum is σ = 442002305022. Its totient is φ = 442002305020.

The previous prime is 442002304897. The next prime is 442002305023. The reversal of 442002305021 is 120503200244.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414929222500 + 27073082521 = 644150^2 + 164539^2 .

It is a cyclic number.

It is not a de Polignac number, because 442002305021 - 2³⁰ = 440928563197 is a prime.

Together with 442002305023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442002305023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221001152510 + 221001152511.

It is an arithmetic number, because the mean of its divisors is an integer number (221001152511).

Almost surely, 2^442002305021 is an apocalyptic number.

It is an amenable number.

442002305021 is a deficient number, since it is larger than the sum of its proper divisors (1).

442002305021 is an equidigital number, since it uses as much as digits as its factorization.

442002305021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 442002305021 its reverse (120503200244), we get a palindrome (562505505265).

The spelling of 442002305021 in words is "four hundred forty-two billion, two million, three hundred five thousand, twenty-one".