21174849 has 6 divisors (see below), whose sum is σ = 30585906. Its totient is φ = 14116560.

The previous prime is 21174847. The next prime is 21174883. The reversal of 21174849 is 94847112.

It can be written as a sum of positive squares in only one way, i.e., 10890000 + 10284849 = 3300^2 + 3207^2 .

It is not a de Polignac number, because 21174849 - 2¹ = 21174847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21174847) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1176372 + ... + 1176389.

It is an arithmetic number, because the mean of its divisors is an integer number (5097651).

Almost surely, 2^21174849 is an apocalyptic number.

It is an amenable number.

21174849 is a deficient number, since it is larger than the sum of its proper divisors (9411057).

21174849 is a wasteful number, since it uses less digits than its factorization.

21174849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352767 (or 2352764 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 21174849 is about 4601.6137386791. The cubic root of 21174849 is about 276.6560088474.

The spelling of 21174849 in words is "twenty-one million, one hundred seventy-four thousand, eight hundred forty-nine".