442453021 has 2 divisors, whose sum is σ = 442453022. Its totient is φ = 442453020.

The previous prime is 442453003. The next prime is 442453031. The reversal of 442453021 is 120354244.

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., 435765625 + 6687396 = 20875^2 + 2586^2 .

It is a cyclic number.

It is not a de Polignac number, because 442453021 - 2¹³ = 442444829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442453031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221226510 + 221226511.

It is an arithmetic number, because the mean of its divisors is an integer number (221226511).

Almost surely, 2^442453021 is an apocalyptic number.

It is an amenable number.

442453021 is a deficient number, since it is larger than the sum of its proper divisors (1).

442453021 is an equidigital number, since it uses as much as digits as its factorization.

442453021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 442453021 is about 21034.5672881569. The cubic root of 442453021 is about 762.0013163522.

The spelling of 442453021 in words is "four hundred forty-two million, four hundred fifty-three thousand, twenty-one".