42735121 has 8 divisors (see below), whose sum is σ = 50206464. Its totient is φ = 35861520.

The previous prime is 42735107. The next prime is 42735139. The reversal of 42735121 is 12153724.

It is a happy number.

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 42735121 - 2⁵ = 42735089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42735101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149281 + ... + 149566.

It is an arithmetic number, because the mean of its divisors is an integer number (6275808).

Almost surely, 2^42735121 is an apocalyptic number.

It is an amenable number.

42735121 is a deficient number, since it is larger than the sum of its proper divisors (7471343).

42735121 is a wasteful number, since it uses less digits than its factorization.

42735121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298871.

The product of its digits is 1680, while the sum is 25.

The square root of 42735121 is about 6537.2104907216. The cubic root of 42735121 is about 349.6189621933.

Adding to 42735121 its reverse (12153724), we get a palindrome (54888845).

The spelling of 42735121 in words is "forty-two million, seven hundred thirty-five thousand, one hundred twenty-one".