42000121 has 8 divisors (see below), whose sum is σ = 43585344. Its totient is φ = 40442640.

The previous prime is 42000109. The next prime is 42000131. The reversal of 42000121 is 12100024.

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 42000121 - 2⁹ = 41999609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42000098 and 42000107.

It is not an unprimeable number, because it can be changed into a prime (42000131) 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, 3826 + ... + 9931.

It is an arithmetic number, because the mean of its divisors is an integer number (5448168).

Almost surely, 2^42000121 is an apocalyptic number.

It is an amenable number.

42000121 is a deficient number, since it is larger than the sum of its proper divisors (1585223).

42000121 is a wasteful number, since it uses less digits than its factorization.

42000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13871.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 42000121 is about 6480.7500337538. The cubic root of 42000121 is about 347.6029982972.

Adding to 42000121 its reverse (12100024), we get a palindrome (54100145).

The spelling of 42000121 in words is "forty-two million, one hundred twenty-one", and thus it is an aban number.