42122145 has 32 divisors (see below), whose sum is σ = 76406400. Its totient is φ = 19643904.

The previous prime is 42122137. The next prime is 42122161. The reversal of 42122145 is 54122124.

It is not a de Polignac number, because 42122145 - 2³ = 42122137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1980 + ... + 9389.

It is an arithmetic number, because the mean of its divisors is an integer number (2387700).

Almost surely, 2^42122145 is an apocalyptic number.

It is an amenable number.

42122145 is a deficient number, since it is larger than the sum of its proper divisors (34284255).

42122145 is a wasteful number, since it uses less digits than its factorization.

42122145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11409.

The product of its digits is 640, while the sum is 21.

The square root of 42122145 is about 6490.1575481648. The cubic root of 42122145 is about 347.9393060355.

Subtracting from 42122145 its sum of digits (21), we obtain a palindrome (42122124).

Adding to 42122145 its reverse (54122124), we get a palindrome (96244269).

The spelling of 42122145 in words is "forty-two million, one hundred twenty-two thousand, one hundred forty-five".