42100225 has 12 divisors (see below), whose sum is σ = 53419696. Its totient is φ = 32896080.

The previous prime is 42100213. The next prime is 42100229. The reversal of 42100225 is 52200124.

It is not a de Polignac number, because 42100225 - 2⁵ = 42100193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42100199 and 42100208.

It is not an unprimeable number, because it can be changed into a prime (42100229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18507 + ... + 20656.

Almost surely, 2^42100225 is an apocalyptic number.

It is an amenable number.

42100225 is a deficient number, since it is larger than the sum of its proper divisors (11319471).

42100225 is a wasteful number, since it uses less digits than its factorization.

42100225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39216 (or 39211 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 42100225 is about 6488.4686174782. The cubic root of 42100225 is about 347.8789406945.

Adding to 42100225 its reverse (52200124), we get a palindrome (94300349).

The spelling of 42100225 in words is "forty-two million, one hundred thousand, two hundred twenty-five".