21010171 has 12 divisors (see below), whose sum is σ = 26321232. Its totient is φ = 16622928.

The previous prime is 21010153. The next prime is 21010177. The reversal of 21010171 is 17101012.

It is not a de Polignac number, because 21010171 - 2¹³ = 21001979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (21010177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15855 + ... + 17128.

It is an arithmetic number, because the mean of its divisors is an integer number (2193436).

Almost surely, 2^21010171 is an apocalyptic number.

21010171 is a deficient number, since it is larger than the sum of its proper divisors (5311061).

21010171 is a wasteful number, since it uses less digits than its factorization.

21010171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33010 (or 33003 counting only the distinct ones).

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 21010171 is about 4583.6853076973. The cubic root of 21010171 is about 275.9369517472.

Adding to 21010171 its reverse (17101012), we get a palindrome (38111183).

The spelling of 21010171 in words is "twenty-one million, ten thousand, one hundred seventy-one".