42121105 has 16 divisors (see below), whose sum is σ = 55206144. Its totient is φ = 30663360.

The previous prime is 42121099. The next prime is 42121147. The reversal of 42121105 is 50112124.

It is not a de Polignac number, because 42121105 - 2³ = 42121097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52 + ... + 9178.

It is an arithmetic number, because the mean of its divisors is an integer number (3450384).

Almost surely, 2^42121105 is an apocalyptic number.

It is an amenable number.

42121105 is a deficient number, since it is larger than the sum of its proper divisors (13085039).

42121105 is a wasteful number, since it uses less digits than its factorization.

42121105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9216.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 42121105 is about 6490.0774263486. The cubic root of 42121105 is about 347.9364424598.

Adding to 42121105 its reverse (50112124), we get a palindrome (92233229).

The spelling of 42121105 in words is "forty-two million, one hundred twenty-one thousand, one hundred five".