42293821 has 4 divisors (see below), whose sum is σ = 42360444. Its totient is φ = 42227200.

The previous prime is 42293809. The next prime is 42293831. The reversal of 42293821 is 12839224.

42293821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 36168196 + 6125625 = 6014^2 + 2475^2 .

It is a cyclic number.

It is not a de Polignac number, because 42293821 - 2⁹ = 42293309 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 (42293831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32350 + ... + 33631.

It is an arithmetic number, because the mean of its divisors is an integer number (10590111).

Almost surely, 2^42293821 is an apocalyptic number.

It is an amenable number.

42293821 is a deficient number, since it is larger than the sum of its proper divisors (66623).

42293821 is an equidigital number, since it uses as much as digits as its factorization.

42293821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66622.

The product of its digits is 6912, while the sum is 31.

The square root of 42293821 is about 6503.3699725604. The cubic root of 42293821 is about 348.4113606686.

The spelling of 42293821 in words is "forty-two million, two hundred ninety-three thousand, eight hundred twenty-one".