21307010 has 8 divisors (see below), whose sum is σ = 38352636. Its totient is φ = 8522800.

The previous prime is 21306997. The next prime is 21307043. The reversal of 21307010 is 1070312.

It can be written as a sum of positive squares in 2 ways, for example, as 18913801 + 2393209 = 4349^2 + 1547^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1065341 + ... + 1065360.

Almost surely, 2^21307010 is an apocalyptic number.

21307010 is a deficient number, since it is larger than the sum of its proper divisors (17045626).

21307010 is a wasteful number, since it uses less digits than its factorization.

21307010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130708.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 21307010 is about 4615.9516895219. The cubic root of 21307010 is about 277.2303904152.

Adding to 21307010 its reverse (1070312), we get a palindrome (22377322).

The spelling of 21307010 in words is "twenty-one million, three hundred seven thousand, ten".