42357021 has 24 divisors (see below), whose sum is σ = 67234464. Its totient is φ = 23637600.

The previous prime is 42357019. The next prime is 42357031. The reversal of 42357021 is 12075324.

It is not a de Polignac number, because 42357021 - 2¹ = 42357019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42356982 and 42357000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42357031) 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 23 ways as a sum of consecutive naturals, for example, 2971 + ... + 9671.

It is an arithmetic number, because the mean of its divisors is an integer number (2801436).

Almost surely, 2^42357021 is an apocalyptic number.

It is an amenable number.

42357021 is a deficient number, since it is larger than the sum of its proper divisors (24877443).

42357021 is a wasteful number, since it uses less digits than its factorization.

42357021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6761 (or 6754 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 42357021 is about 6508.2271779648. The cubic root of 42357021 is about 348.5848189386.

The spelling of 42357021 in words is "forty-two million, three hundred fifty-seven thousand, twenty-one".