21347170 has 16 divisors (see below), whose sum is σ = 41380920. Its totient is φ = 7881984.

The previous prime is 21347149. The next prime is 21347177. The reversal of 21347170 is 7174312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9006001 + 12341169 = 3001^2 + 3513^2 .

It is not an unprimeable number, because it can be changed into a prime (21347177) 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 7 ways as a sum of consecutive naturals, for example, 81975 + ... + 82234.

Almost surely, 2^21347170 is an apocalyptic number.

21347170 is a deficient number, since it is larger than the sum of its proper divisors (20033750).

21347170 is a wasteful number, since it uses less digits than its factorization.

21347170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164229.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21347170 is about 4620.2997738242. The cubic root of 21347170 is about 277.4044580866.

The spelling of 21347170 in words is "twenty-one million, three hundred forty-seven thousand, one hundred seventy".