42095021 has 4 divisors (see below), whose sum is σ = 42108000. Its totient is φ = 42082044.

The previous prime is 42094981. The next prime is 42095023. The reversal of 42095021 is 12059024.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42095021 - 2⁶ = 42094957 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 (42095023) 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, 3080 + ... + 9678.

It is an arithmetic number, because the mean of its divisors is an integer number (10527000).

Almost surely, 2^42095021 is an apocalyptic number.

It is an amenable number.

42095021 is a deficient number, since it is larger than the sum of its proper divisors (12979).

42095021 is an equidigital number, since it uses as much as digits as its factorization.

42095021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12978.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 42095021 is about 6488.0675859612. The cubic root of 42095021 is about 347.8646063561.

The spelling of 42095021 in words is "forty-two million, ninety-five thousand, twenty-one".