21027170 has 8 divisors (see below), whose sum is σ = 37848924. Its totient is φ = 8410864.

The previous prime is 21027169. The next prime is 21027173. The reversal of 21027170 is 7172012.

It can be written as a sum of positive squares in 2 ways, for example, as 18003049 + 3024121 = 4243^2 + 1739^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21027173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051349 + ... + 1051368.

Almost surely, 2^21027170 is an apocalyptic number.

21027170 is a deficient number, since it is larger than the sum of its proper divisors (16821754).

21027170 is a wasteful number, since it uses less digits than its factorization.

21027170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102724.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 21027170 is about 4585.5392267431. The cubic root of 21027170 is about 276.0113504399.

Adding to 21027170 its reverse (7172012), we get a palindrome (28199182).

The spelling of 21027170 in words is "twenty-one million, twenty-seven thousand, one hundred seventy".