42166532221 has 8 divisors (see below), whose sum is σ = 46001944800. Its totient is φ = 38331468240.

The previous prime is 42166532207. The next prime is 42166532251. The reversal of 42166532221 is 12223566124.

42166532221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42166532221 - 2²¹ = 42164435069 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 (42166532251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209775 + ... + 358243.

It is an arithmetic number, because the mean of its divisors is an integer number (5750243100).

Almost surely, 2^42166532221 is an apocalyptic number.

It is an amenable number.

42166532221 is a deficient number, since it is larger than the sum of its proper divisors (3835412579).

42166532221 is a wasteful number, since it uses less digits than its factorization.

42166532221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174299.

The product of its digits is 34560, while the sum is 34.

The spelling of 42166532221 in words is "forty-two billion, one hundred sixty-six million, five hundred thirty-two thousand, two hundred twenty-one".