42100121 has 8 divisors (see below), whose sum is σ = 48294144. Its totient is φ = 35951040.

The previous prime is 42100111. The next prime is 42100151. The reversal of 42100121 is 12100124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42100121 - 2¹⁴ = 42083737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42100111) 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 7 ways as a sum of consecutive naturals, for example, 9200 + ... + 12993.

It is an arithmetic number, because the mean of its divisors is an integer number (6036768).

Almost surely, 2^42100121 is an apocalyptic number.

It is an amenable number.

42100121 is a deficient number, since it is larger than the sum of its proper divisors (6194023).

42100121 is a wasteful number, since it uses less digits than its factorization.

42100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22471.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 42100121 is about 6488.4606032556. The cubic root of 42100121 is about 347.8786542396.

Adding to 42100121 its reverse (12100124), we get a palindrome (54200245).

The spelling of 42100121 in words is "forty-two million, one hundred thousand, one hundred twenty-one".