21212036012347 has 2 divisors, whose sum is σ = 21212036012348. Its totient is φ = 21212036012346.

The previous prime is 21212036012329. The next prime is 21212036012351. The reversal of 21212036012347 is 74321063021212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212036012347 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212036012357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606018006173 + 10606018006174.

It is an arithmetic number, because the mean of its divisors is an integer number (10606018006174).

Almost surely, 2^{21212036012347} is an apocalyptic number.

21212036012347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212036012347 is an equidigital number, since it uses as much as digits as its factorization.

21212036012347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

Adding to 21212036012347 its reverse (74321063021212), we get a palindrome (95533099033559).

The spelling of 21212036012347 in words is "twenty-one trillion, two hundred twelve billion, thirty-six million, twelve thousand, three hundred forty-seven".