21124266462647 has 2 divisors, whose sum is σ = 21124266462648. Its totient is φ = 21124266462646.

The previous prime is 21124266462631. The next prime is 21124266462713. The reversal of 21124266462647 is 74626466242112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21124266462647 - 2⁴ = 21124266462631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124266462547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562133231323 + 10562133231324.

It is an arithmetic number, because the mean of its divisors is an integer number (10562133231324).

Almost surely, 2^{21124266462647} is an apocalyptic number.

21124266462647 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124266462647 is an equidigital number, since it uses as much as digits as its factorization.

21124266462647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 53.

The spelling of 21124266462647 in words is "twenty-one trillion, one hundred twenty-four billion, two hundred sixty-six million, four hundred sixty-two thousand, six hundred forty-seven".