21320212307 has 2 divisors, whose sum is σ = 21320212308. Its totient is φ = 21320212306.

The previous prime is 21320212301. The next prime is 21320212327. The reversal of 21320212307 is 70321202312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21320212307 is a prime.

It is not a weakly prime, because it can be changed into another prime (21320212301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660106153 + 10660106154.

It is an arithmetic number, because the mean of its divisors is an integer number (10660106154).

Almost surely, 2^21320212307 is an apocalyptic number.

21320212307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320212307 is an equidigital number, since it uses as much as digits as its factorization.

21320212307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

Adding to 21320212307 its reverse (70321202312), we get a palindrome (91641414619).

The spelling of 21320212307 in words is "twenty-one billion, three hundred twenty million, two hundred twelve thousand, three hundred seven".