21000110122247 has 2 divisors, whose sum is σ = 21000110122248. Its totient is φ = 21000110122246.

The previous prime is 21000110122109. The next prime is 21000110122253. The reversal of 21000110122247 is 74222101100012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000110122247 - 2¹² = 21000110118151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000110128247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500055061123 + 10500055061124.

It is an arithmetic number, because the mean of its divisors is an integer number (10500055061124).

Almost surely, 2^{21000110122247} is an apocalyptic number.

21000110122247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000110122247 is an equidigital number, since it uses as much as digits as its factorization.

21000110122247 is an evil number, because the sum of its binary digits is even.

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

Adding to 21000110122247 its reverse (74222101100012), we get a palindrome (95222211222259).

The spelling of 21000110122247 in words is "twenty-one trillion, one hundred ten million, one hundred twenty-two thousand, two hundred forty-seven".