42120133 has 4 divisors (see below), whose sum is σ = 45949248. Its totient is φ = 38291020.

The previous prime is 42120119. The next prime is 42120157. The reversal of 42120133 is 33102124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42120133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42120233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1914541 + ... + 1914562.

It is an arithmetic number, because the mean of its divisors is an integer number (11487312).

Almost surely, 2^42120133 is an apocalyptic number.

It is an amenable number.

42120133 is a deficient number, since it is larger than the sum of its proper divisors (3829115).

42120133 is a wasteful number, since it uses less digits than its factorization.

42120133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829114.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 42120133 is about 6490.0025423724. The cubic root of 42120133 is about 347.9337660753.

Adding to 42120133 its reverse (33102124), we get a palindrome (75222257).

Subtracting from 42120133 its reverse (33102124), we obtain a square (9018009 = 3003²).

The spelling of 42120133 in words is "forty-two million, one hundred twenty thousand, one hundred thirty-three".