21212000110247 has 2 divisors, whose sum is σ = 21212000110248. Its totient is φ = 21212000110246.

The previous prime is 21212000110199. The next prime is 21212000110261. The reversal of 21212000110247 is 74201100021212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212000110247 - 2⁶ = 21212000110183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212000110277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606000055123 + 10606000055124.

It is an arithmetic number, because the mean of its divisors is an integer number (10606000055124).

Almost surely, 2^{21212000110247} is an apocalyptic number.

21212000110247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212000110247 is an equidigital number, since it uses as much as digits as its factorization.

21212000110247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21212000110247 its reverse (74201100021212), we get a palindrome (95413100131459).

The spelling of 21212000110247 in words is "twenty-one trillion, two hundred twelve billion, one hundred ten thousand, two hundred forty-seven".