442856370813721 has 2 divisors, whose sum is σ = 442856370813722. Its totient is φ = 442856370813720.

The previous prime is 442856370813709. The next prime is 442856370813737. The reversal of 442856370813721 is 127318073658244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387909568976400 + 54946801837321 = 19695420^2 + 7412611^2 .

It is a cyclic number.

It is not a de Polignac number, because 442856370813721 - 2⁹ = 442856370813209 is a prime.

It is a super-2 number, since 2×442856370813721² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 442856370813721.

It is not a weakly prime, because it can be changed into another prime (442856370816721) 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, 221428185406860 + 221428185406861.

It is an arithmetic number, because the mean of its divisors is an integer number (221428185406861).

Almost surely, 2^{442856370813721} is an apocalyptic number.

It is an amenable number.

442856370813721 is a deficient number, since it is larger than the sum of its proper divisors (1).

442856370813721 is an equidigital number, since it uses as much as digits as its factorization.

442856370813721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54190080, while the sum is 61.

The spelling of 442856370813721 in words is "four hundred forty-two trillion, eight hundred fifty-six billion, three hundred seventy million, eight hundred thirteen thousand, seven hundred twenty-one".