42167221 has 4 divisors (see below), whose sum is σ = 42641100. Its totient is φ = 41693344.

The previous prime is 42167207. The next prime is 42167231. The reversal of 42167221 is 12276124.

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 20124196 + 22043025 = 4486^2 + 4695^2 .

It is a cyclic number.

It is not a de Polignac number, because 42167221 - 2¹⁷ = 42036149 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 (42167201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236806 + ... + 236983.

It is an arithmetic number, because the mean of its divisors is an integer number (10660275).

Almost surely, 2^42167221 is an apocalyptic number.

It is an amenable number.

42167221 is a deficient number, since it is larger than the sum of its proper divisors (473879).

42167221 is an equidigital number, since it uses as much as digits as its factorization.

42167221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473878.

The product of its digits is 1344, while the sum is 25.

The square root of 42167221 is about 6493.6292625927. The cubic root of 42167221 is about 348.0633747486.

The spelling of 42167221 in words is "forty-two million, one hundred sixty-seven thousand, two hundred twenty-one".