21101171 has 12 divisors (see below), whose sum is σ = 26114832. Its totient is φ = 16694496.

The previous prime is 21101123. The next prime is 21101207. The reversal of 21101171 is 17110112.

It is not a de Polignac number, because 21101171 - 2¹⁴ = 21084787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101371) 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, 7736 + ... + 10101.

It is an arithmetic number, because the mean of its divisors is an integer number (2176236).

Almost surely, 2^21101171 is an apocalyptic number.

21101171 is a deficient number, since it is larger than the sum of its proper divisors (5013661).

21101171 is a wasteful number, since it uses less digits than its factorization.

21101171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17870 (or 17857 counting only the distinct ones).

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

The square root of 21101171 is about 4593.6010928247. The cubic root of 21101171 is about 276.3347606111.

Adding to 21101171 its reverse (17110112), we get a palindrome (38211283).

The spelling of 21101171 in words is "twenty-one million, one hundred one thousand, one hundred seventy-one".