42100125 has 32 divisors (see below), whose sum is σ = 70671744. Its totient is φ = 22256000.

The previous prime is 42100111. The next prime is 42100151. The reversal of 42100125 is 52100124.

It is not a de Polignac number, because 42100125 - 2⁶ = 42100061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48697 + ... + 49553.

It is an arithmetic number, because the mean of its divisors is an integer number (2208492).

Almost surely, 2^42100125 is an apocalyptic number.

It is an amenable number.

42100125 is a deficient number, since it is larger than the sum of its proper divisors (28571619).

42100125 is a wasteful number, since it uses less digits than its factorization.

42100125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006 (or 996 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 42100125 is about 6488.4609114951. The cubic root of 42100125 is about 347.8786652571.

Adding to 42100125 its reverse (52100124), we get a palindrome (94200249).

Subtracting 42100125 from its reverse (52100124), we obtain a palindrome (9999999).

The spelling of 42100125 in words is "forty-two million, one hundred thousand, one hundred twenty-five".