42021667 has 12 divisors (see below), whose sum is σ = 45542160. Its totient is φ = 38654000.

The previous prime is 42021641. The next prime is 42021689. The reversal of 42021667 is 76612024.

It is a de Polignac number, because none of the positive numbers 2^k-42021667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42022667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167292 + ... + 167542.

It is an arithmetic number, because the mean of its divisors is an integer number (3795180).

Almost surely, 2^42021667 is an apocalyptic number.

42021667 is a deficient number, since it is larger than the sum of its proper divisors (3520493).

42021667 is an equidigital number, since it uses as much as digits as its factorization.

42021667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 42021667 is about 6482.4121282128. The cubic root of 42021667 is about 347.6624280774.

The spelling of 42021667 in words is "forty-two million, twenty-one thousand, six hundred sixty-seven".