21371170 has 8 divisors (see below), whose sum is σ = 38468124. Its totient is φ = 8548464.

The previous prime is 21371153. The next prime is 21371171. The reversal of 21371170 is 7117312.

It can be written as a sum of positive squares in 2 ways, for example, as 20511841 + 859329 = 4529^2 + 927^2 .

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 (21371171) 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, 1068549 + ... + 1068568.

Almost surely, 2^21371170 is an apocalyptic number.

21371170 is a deficient number, since it is larger than the sum of its proper divisors (17096954).

21371170 is a wasteful number, since it uses less digits than its factorization.

21371170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137124.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 21371170 is about 4622.8962783087. The cubic root of 21371170 is about 277.5083783960.

Adding to 21371170 its reverse (7117312), we get a palindrome (28488482).

The spelling of 21371170 in words is "twenty-one million, three hundred seventy-one thousand, one hundred seventy".