42121425 has 24 divisors (see below), whose sum is σ = 69848704. Its totient is φ = 22397760.

The previous prime is 42121399. The next prime is 42121459. The reversal of 42121425 is 52412124.

It is not a de Polignac number, because 42121425 - 2⁶ = 42121361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 34119 + ... + 35331.

Almost surely, 2^42121425 is an apocalyptic number.

It is an amenable number.

42121425 is a deficient number, since it is larger than the sum of its proper divisors (27727279).

42121425 is a wasteful number, since it uses less digits than its factorization.

42121425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689 (or 1684 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 42121425 is about 6490.1020793205. The cubic root of 42121425 is about 347.9373235650.

Adding to 42121425 its reverse (52412124), we get a palindrome (94533549).

The spelling of 42121425 in words is "forty-two million, one hundred twenty-one thousand, four hundred twenty-five".