21307035 has 16 divisors (see below), whose sum is σ = 36097056. Its totient is φ = 10695168.

The previous prime is 21306997. The next prime is 21307043. The reversal of 21307035 is 53070312.

It is a happy number.

It is not a de Polignac number, because 21307035 - 2¹⁹ = 20782747 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 41524 + ... + 42033.

It is an arithmetic number, because the mean of its divisors is an integer number (2256066).

Almost surely, 2^21307035 is an apocalyptic number.

21307035 is a deficient number, since it is larger than the sum of its proper divisors (14790021).

21307035 is a wasteful number, since it uses less digits than its factorization.

21307035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83582.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 21307035 is about 4615.9543975217. The cubic root of 21307035 is about 277.2304988421.

Adding to 21307035 its reverse (53070312), we get a palindrome (74377347).

The spelling of 21307035 in words is "twenty-one million, three hundred seven thousand, thirty-five".