442332421 has 2 divisors, whose sum is σ = 442332422. Its totient is φ = 442332420.

The previous prime is 442332409. The next prime is 442332467. The reversal of 442332421 is 124233244.

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., 437269921 + 5062500 = 20911^2 + 2250^2 .

It is a cyclic number.

It is not a de Polignac number, because 442332421 - 2¹¹ = 442330373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442332221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221166210 + 221166211.

It is an arithmetic number, because the mean of its divisors is an integer number (221166211).

Almost surely, 2^442332421 is an apocalyptic number.

It is an amenable number.

442332421 is a deficient number, since it is larger than the sum of its proper divisors (1).

442332421 is an equidigital number, since it uses as much as digits as its factorization.

442332421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 25.

The square root of 442332421 is about 21031.7003829933. The cubic root of 442332421 is about 761.9320768283.

Adding to 442332421 its reverse (124233244), we get a palindrome (566565665).

The spelling of 442332421 in words is "four hundred forty-two million, three hundred thirty-two thousand, four hundred twenty-one".