42216425 has 6 divisors (see below), whose sum is σ = 52348398. Its totient is φ = 33773120.

The previous prime is 42216407. The next prime is 42216439. The reversal of 42216425 is 52461224.

It can be written as a sum of positive squares in 3 ways, for example, as 781456 + 41434969 = 884^2 + 6437^2 .

It is not a de Polignac number, because 42216425 - 2¹⁸ = 41954281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42216394 and 42216403.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 844304 + ... + 844353.

It is an arithmetic number, because the mean of its divisors is an integer number (8724733).

Almost surely, 2^42216425 is an apocalyptic number.

It is an amenable number.

42216425 is a deficient number, since it is larger than the sum of its proper divisors (10131973).

42216425 is a wasteful number, since it uses less digits than its factorization.

42216425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688667 (or 1688662 counting only the distinct ones).

The product of its digits is 3840, while the sum is 26.

The square root of 42216425 is about 6497.4167943884. The cubic root of 42216425 is about 348.1987046157.

Adding to 42216425 its reverse (52461224), we get a palindrome (94677649).

The spelling of 42216425 in words is "forty-two million, two hundred sixteen thousand, four hundred twenty-five".