42721133 has 32 divisors (see below), whose sum is σ = 54700800. Its totient is φ = 32472576.

The previous prime is 42721123. The next prime is 42721163. The reversal of 42721133 is 33112724.

It is a cyclic number.

It is not a de Polignac number, because 42721133 - 2⁴ = 42721117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42721099 and 42721108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 391883 + ... + 391991.

It is an arithmetic number, because the mean of its divisors is an integer number (1709400).

Almost surely, 2^42721133 is an apocalyptic number.

It is an amenable number.

42721133 is a deficient number, since it is larger than the sum of its proper divisors (11979667).

42721133 is a wasteful number, since it uses less digits than its factorization.

42721133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261.

The product of its digits is 1008, while the sum is 23.

The square root of 42721133 is about 6536.1405278650. The cubic root of 42721133 is about 349.5808124341.

Adding to 42721133 its reverse (33112724), we get a palindrome (75833857).

The spelling of 42721133 in words is "forty-two million, seven hundred twenty-one thousand, one hundred thirty-three".