42100425 has 48 divisors (see below), whose sum is σ = 78258880. Its totient is φ = 22187520.

The previous prime is 42100423. The next prime is 42100433. The reversal of 42100425 is 52400124.

It is not a de Polignac number, because 42100425 - 2¹ = 42100423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42100398 and 42100407.

It is not an unprimeable number, because it can be changed into a prime (42100423) 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 in 47 ways as a sum of consecutive naturals, for example, 65154 + ... + 65796.

Almost surely, 2^42100425 is an apocalyptic number.

42100425 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42100425 is a deficient number, since it is larger than the sum of its proper divisors (36158455).

42100425 is a wasteful number, since it uses less digits than its factorization.

42100425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 42100425 is about 6488.4840294170. The cubic root of 42100425 is about 347.8794915678.

Adding to 42100425 its reverse (52400124), we get a palindrome (94500549).

The spelling of 42100425 in words is "forty-two million, one hundred thousand, four hundred twenty-five".