442134152021 has 2 divisors, whose sum is σ = 442134152022. Its totient is φ = 442134152020.

The previous prime is 442134152017. The next prime is 442134152039. The reversal of 442134152021 is 120251431244.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296900752996 + 145233399025 = 544886^2 + 381095^2 .

It is a cyclic number.

It is not a de Polignac number, because 442134152021 - 2² = 442134152017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442134152071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221067076010 + 221067076011.

It is an arithmetic number, because the mean of its divisors is an integer number (221067076011).

Almost surely, 2^442134152021 is an apocalyptic number.

It is an amenable number.

442134152021 is a deficient number, since it is larger than the sum of its proper divisors (1).

442134152021 is an equidigital number, since it uses as much as digits as its factorization.

442134152021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 442134152021 its reverse (120251431244), we get a palindrome (562385583265).

The spelling of 442134152021 in words is "four hundred forty-two billion, one hundred thirty-four million, one hundred fifty-two thousand, twenty-one".