166701021 has 8 divisors (see below), whose sum is σ = 228275424. Its totient is φ = 108130320.

The previous prime is 166701013. The next prime is 166701047. The reversal of 166701021 is 120107661.

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

It is not a de Polignac number, because 166701021 - 2³ = 166701013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166700982 and 166701000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166701001) 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, 750795 + ... + 751016.

It is an arithmetic number, because the mean of its divisors is an integer number (28534428).

Almost surely, 2^166701021 is an apocalyptic number.

It is an amenable number.

166701021 is a deficient number, since it is larger than the sum of its proper divisors (61574403).

166701021 is a wasteful number, since it uses less digits than its factorization.

166701021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501851.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 166701021 is about 12911.2749564092. The cubic root of 166701021 is about 550.3590173879.

Adding to 166701021 its reverse (120107661), we get a palindrome (286808682).

The spelling of 166701021 in words is "one hundred sixty-six million, seven hundred one thousand, twenty-one".