21231330323347 has 2 divisors, whose sum is σ = 21231330323348. Its totient is φ = 21231330323346.

The previous prime is 21231330323263. The next prime is 21231330323417. The reversal of 21231330323347 is 74332303313212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21231330323347 - 2¹⁹ = 21231329799059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21231330323747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615665161673 + 10615665161674.

It is an arithmetic number, because the mean of its divisors is an integer number (10615665161674).

Almost surely, 2^{21231330323347} is an apocalyptic number.

21231330323347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231330323347 is an equidigital number, since it uses as much as digits as its factorization.

21231330323347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 37.

Adding to 21231330323347 its reverse (74332303313212), we get a palindrome (95563633636559).

The spelling of 21231330323347 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred thirty million, three hundred twenty-three thousand, three hundred forty-seven".