42121133 has 4 divisors (see below), whose sum is σ = 43259580. Its totient is φ = 40982688.

The previous prime is 42121099. The next prime is 42121147. The reversal of 42121133 is 33112124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31382404 + 10738729 = 5602^2 + 3277^2 .

It is a cyclic number.

It is not a de Polignac number, because 42121133 - 2⁸ = 42120877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121153) 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, 569168 + ... + 569241.

It is an arithmetic number, because the mean of its divisors is an integer number (10814895).

Almost surely, 2^42121133 is an apocalyptic number.

It is an amenable number.

42121133 is a deficient number, since it is larger than the sum of its proper divisors (1138447).

42121133 is a wasteful number, since it uses less digits than its factorization.

42121133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138446.

The product of its digits is 144, while the sum is 17.

The square root of 42121133 is about 6490.0795834874. The cubic root of 42121133 is about 347.9365195567.

Adding to 42121133 its reverse (33112124), we get a palindrome (75233257).

Subtracting from 42121133 its reverse (33112124), we obtain a palindrome (9009009).

The spelling of 42121133 in words is "forty-two million, one hundred twenty-one thousand, one hundred thirty-three".