21003229307 has 2 divisors, whose sum is σ = 21003229308. Its totient is φ = 21003229306.

The previous prime is 21003229267. The next prime is 21003229319. The reversal of 21003229307 is 70392230012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21003229307 - 2¹⁶ = 21003163771 is a prime.

It is a super-2 number, since 2×21003229307² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003229307.

It is not a weakly prime, because it can be changed into another prime (21003229397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501614653 + 10501614654.

It is an arithmetic number, because the mean of its divisors is an integer number (10501614654).

Almost surely, 2^21003229307 is an apocalyptic number.

21003229307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003229307 is an equidigital number, since it uses as much as digits as its factorization.

21003229307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 29.

Adding to 21003229307 its reverse (70392230012), we get a palindrome (91395459319).

The spelling of 21003229307 in words is "twenty-one billion, three million, two hundred twenty-nine thousand, three hundred seven".