42404121 has 16 divisors (see below), whose sum is σ = 62958720. Its totient is φ = 28207440.

The previous prime is 42404113. The next prime is 42404147. The reversal of 42404121 is 12140424.

It is not a de Polignac number, because 42404121 - 2³ = 42404113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42404094 and 42404103.

It is not an unprimeable number, because it can be changed into a prime (42400121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13156 + ... + 16058.

It is an arithmetic number, because the mean of its divisors is an integer number (3934920).

Almost surely, 2^42404121 is an apocalyptic number.

It is an amenable number.

42404121 is a deficient number, since it is larger than the sum of its proper divisors (20554599).

42404121 is a wasteful number, since it uses less digits than its factorization.

42404121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3453 (or 3447 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 42404121 is about 6511.8446695234. The cubic root of 42404121 is about 348.7139770863.

Adding to 42404121 its reverse (12140424), we get a palindrome (54544545).

The spelling of 42404121 in words is "forty-two million, four hundred four thousand, one hundred twenty-one".