42710021 has 4 divisors (see below), whose sum is σ = 43347552. Its totient is φ = 42072492.

The previous prime is 42710009. The next prime is 42710023. The reversal of 42710021 is 12001724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42710021 - 2⁶ = 42709957 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 (42710023) 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, 318665 + ... + 318798.

It is an arithmetic number, because the mean of its divisors is an integer number (10836888).

Almost surely, 2^42710021 is an apocalyptic number.

It is an amenable number.

42710021 is a deficient number, since it is larger than the sum of its proper divisors (637531).

42710021 is an equidigital number, since it uses as much as digits as its factorization.

42710021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637530.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 42710021 is about 6535.2904296596. The cubic root of 42710021 is about 349.5505005130.

Adding to 42710021 its reverse (12001724), we get a palindrome (54711745).

The spelling of 42710021 in words is "forty-two million, seven hundred ten thousand, twenty-one".