42890121 has 8 divisors (see below), whose sum is σ = 63540960. Its totient is φ = 28593396.

The previous prime is 42890119. The next prime is 42890123. The reversal of 42890121 is 12109824.

42890121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (42890119) and next prime (42890123).

It is not a de Polignac number, because 42890121 - 2¹ = 42890119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1588523 = 42890121 / (4 + 2 + 8 + 9 + 0 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (42890123) 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, 794235 + ... + 794288.

It is an arithmetic number, because the mean of its divisors is an integer number (7942620).

Almost surely, 2^42890121 is an apocalyptic number.

It is an amenable number.

42890121 is a deficient number, since it is larger than the sum of its proper divisors (20650839).

42890121 is a wasteful number, since it uses less digits than its factorization.

42890121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588532 (or 1588526 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 42890121 is about 6549.0549699938. The cubic root of 42890121 is about 350.0411407422.

Adding to 42890121 its reverse (12109824), we get a palindrome (54999945).

The spelling of 42890121 in words is "forty-two million, eight hundred ninety thousand, one hundred twenty-one".