21302231947 has 2 divisors, whose sum is σ = 21302231948. Its totient is φ = 21302231946.

The previous prime is 21302231941. The next prime is 21302231971. The reversal of 21302231947 is 74913220312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302231947 is a prime.

It is not a weakly prime, because it can be changed into another prime (21302231941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651115973 + 10651115974.

It is an arithmetic number, because the mean of its divisors is an integer number (10651115974).

Almost surely, 2^21302231947 is an apocalyptic number.

21302231947 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302231947 is an equidigital number, since it uses as much as digits as its factorization.

21302231947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 21302231947 in words is "twenty-one billion, three hundred two million, two hundred thirty-one thousand, nine hundred forty-seven".