442440430111021 has 2 divisors, whose sum is σ = 442440430111022. Its totient is φ = 442440430111020.

The previous prime is 442440430111019. The next prime is 442440430111051. The reversal of 442440430111021 is 120111034044244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441061952175625 + 1378477935396 = 21001475^2 + 1174086^2 .

It is a cyclic number.

It is not a de Polignac number, because 442440430111021 - 2¹ = 442440430111019 is a prime.

Together with 442440430111019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442440430111051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221220215055510 + 221220215055511.

It is an arithmetic number, because the mean of its divisors is an integer number (221220215055511).

Almost surely, 2^{442440430111021} is an apocalyptic number.

It is an amenable number.

442440430111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

442440430111021 is an equidigital number, since it uses as much as digits as its factorization.

442440430111021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 31.

Adding to 442440430111021 its reverse (120111034044244), we get a palindrome (562551464155265).

The spelling of 442440430111021 in words is "four hundred forty-two trillion, four hundred forty billion, four hundred thirty million, one hundred eleven thousand, twenty-one".