42807121 has 8 divisors (see below), whose sum is σ = 49014720. Its totient is φ = 36622608.

The previous prime is 42807119. The next prime is 42807137. The reversal of 42807121 is 12170824.

It is a happy number.

42807121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42807121 - 2¹ = 42807119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42807101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1591 + ... + 9388.

It is an arithmetic number, because the mean of its divisors is an integer number (6126840).

Almost surely, 2^42807121 is an apocalyptic number.

It is an amenable number.

42807121 is a deficient number, since it is larger than the sum of its proper divisors (6207599).

42807121 is a wasteful number, since it uses less digits than its factorization.

42807121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11543.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 42807121 is about 6542.7151091882. The cubic root of 42807121 is about 349.8151976784.

Adding to 42807121 its reverse (12170824), we get a palindrome (54977945).

The spelling of 42807121 in words is "forty-two million, eight hundred seven thousand, one hundred twenty-one".