42121617 has 4 divisors (see below), whose sum is σ = 56162160. Its totient is φ = 28081076.

The previous prime is 42121603. The next prime is 42121621. The reversal of 42121617 is 71612124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42121617 - 2⁸ = 42121361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42121217) 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 3 ways as a sum of consecutive naturals, for example, 7020267 + ... + 7020272.

It is an arithmetic number, because the mean of its divisors is an integer number (14040540).

Almost surely, 2^42121617 is an apocalyptic number.

It is an amenable number.

42121617 is a deficient number, since it is larger than the sum of its proper divisors (14040543).

42121617 is a wasteful number, since it uses less digits than its factorization.

42121617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14040542.

The product of its digits is 672, while the sum is 24.

The square root of 42121617 is about 6490.1168710586. The cubic root of 42121617 is about 347.9378522261.

The spelling of 42121617 in words is "forty-two million, one hundred twenty-one thousand, six hundred seventeen".