21307021307 has 32 divisors (see below), whose sum is σ = 25452100800. Its totient is φ = 17582400000.

The previous prime is 21307021273. The next prime is 21307021331. The reversal of 21307021307 is 70312070312.

It is not a de Polignac number, because 21307021307 - 2¹⁶ = 21306955771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21307021397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2147057 + ... + 2156957.

It is an arithmetic number, because the mean of its divisors is an integer number (795378150).

Almost surely, 2^21307021307 is an apocalyptic number.

21307021307 is a deficient number, since it is larger than the sum of its proper divisors (4145079493).

21307021307 is a wasteful number, since it uses less digits than its factorization.

21307021307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10175.

The product of its (nonzero) digits is 1764, while the sum is 26.

Adding to 21307021307 its reverse (70312070312), we get a palindrome (91619091619).

The spelling of 21307021307 in words is "twenty-one billion, three hundred seven million, twenty-one thousand, three hundred seven".