21000112247 has 2 divisors, whose sum is σ = 21000112248. Its totient is φ = 21000112246.

The previous prime is 21000112207. The next prime is 21000112297. The reversal of 21000112247 is 74221100012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000112247 - 2⁶ = 21000112183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000112207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500056123 + 10500056124.

It is an arithmetic number, because the mean of its divisors is an integer number (10500056124).

Almost surely, 2^21000112247 is an apocalyptic number.

21000112247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000112247 is an equidigital number, since it uses as much as digits as its factorization.

21000112247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21000112247 its reverse (74221100012), we get a palindrome (95221212259).

The spelling of 21000112247 in words is "twenty-one billion, one hundred twelve thousand, two hundred forty-seven".