21302421347 has 2 divisors, whose sum is σ = 21302421348. Its totient is φ = 21302421346.

The previous prime is 21302421341. The next prime is 21302421383. The reversal of 21302421347 is 74312420312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302421347 is a prime.

It is not a weakly prime, because it can be changed into another prime (21302421341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651210673 + 10651210674.

It is an arithmetic number, because the mean of its divisors is an integer number (10651210674).

Almost surely, 2^21302421347 is an apocalyptic number.

21302421347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302421347 is an equidigital number, since it uses as much as digits as its factorization.

21302421347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 29.

Adding to 21302421347 its reverse (74312420312), we get a palindrome (95614841659).

The spelling of 21302421347 in words is "twenty-one billion, three hundred two million, four hundred twenty-one thousand, three hundred forty-seven".