42241421 has 2 divisors, whose sum is σ = 42241422.
Its totient is φ = 42241420.
The previous prime is 42241417. The next prime is 42241519. The reversal of 42241421 is 12414224.
Adding to 42241421 its reverse (12414224), we get a palindrome (54655645).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 30096196 + 12145225 = 5486^2 + 3485^2
It is a cyclic number.
It is not a de Polignac number, because 42241421 - 22 = 42241417 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 42241393 and 42241402.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (42241411) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21120710 + 21120711.
It is an arithmetic number, because the mean of its divisors is an integer number (21120711).
Almost surely, 242241421 is an apocalyptic number.
It is an amenable number.
42241421 is a deficient number, since it is larger than the sum of its proper divisors (1).
42241421 is an equidigital number, since it uses as much as digits as its factorization.
42241421 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 512, while the sum is 20.
The square root of 42241421 is about 6499.3400434198.
The cubic root of 42241421 is about 348.2674129255.
The spelling of 42241421 in words is "forty-two million, two hundred forty-one thousand, four hundred twenty-one".