21133011247 has 2 divisors, whose sum is σ = 21133011248. Its totient is φ = 21133011246.

The previous prime is 21133011217. The next prime is 21133011257. The reversal of 21133011247 is 74211033112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21133011247 - 2¹¹ = 21133009199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21133011217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566505623 + 10566505624.

It is an arithmetic number, because the mean of its divisors is an integer number (10566505624).

Almost surely, 2^21133011247 is an apocalyptic number.

21133011247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133011247 is an equidigital number, since it uses as much as digits as its factorization.

21133011247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 21133011247 its reverse (74211033112), we get a palindrome (95344044359).

The spelling of 21133011247 in words is "twenty-one billion, one hundred thirty-three million, eleven thousand, two hundred forty-seven".