42473021 has 4 divisors (see below), whose sum is σ = 44971452. Its totient is φ = 39974592.

The previous prime is 42472993. The next prime is 42473029. The reversal of 42473021 is 12037424.

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 16605625 + 25867396 = 4075^2 + 5086^2 .

It is a cyclic number.

It is not a de Polignac number, because 42473021 - 2¹⁰ = 42471997 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 (42473029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1249190 + ... + 1249223.

It is an arithmetic number, because the mean of its divisors is an integer number (11242863).

Almost surely, 2^42473021 is an apocalyptic number.

It is an amenable number.

42473021 is a deficient number, since it is larger than the sum of its proper divisors (2498431).

42473021 is a wasteful number, since it uses less digits than its factorization.

42473021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2498430.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 42473021 is about 6517.1328818737. The cubic root of 42473021 is about 348.9027432656.

The spelling of 42473021 in words is "forty-two million, four hundred seventy-three thousand, twenty-one".