21211044002347 has 2 divisors, whose sum is σ = 21211044002348. Its totient is φ = 21211044002346.

The previous prime is 21211044002321. The next prime is 21211044002387. The reversal of 21211044002347 is 74320044011212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211044002347 - 2³⁹ = 20661288188459 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211044002387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605522001173 + 10605522001174.

It is an arithmetic number, because the mean of its divisors is an integer number (10605522001174).

Almost surely, 2^{21211044002347} is an apocalyptic number.

21211044002347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211044002347 is an equidigital number, since it uses as much as digits as its factorization.

21211044002347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 31.

Adding to 21211044002347 its reverse (74320044011212), we get a palindrome (95531088013559).

The spelling of 21211044002347 in words is "twenty-one trillion, two hundred eleven billion, forty-four million, two thousand, three hundred forty-seven".