21004134141247 has 2 divisors, whose sum is σ = 21004134141248. Its totient is φ = 21004134141246.

The previous prime is 21004134141203. The next prime is 21004134141313. The reversal of 21004134141247 is 74214143140012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21004134141247 - 2¹¹ = 21004134139199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21004134141047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502067070623 + 10502067070624.

It is an arithmetic number, because the mean of its divisors is an integer number (10502067070624).

Almost surely, 2^{21004134141247} is an apocalyptic number.

21004134141247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004134141247 is an equidigital number, since it uses as much as digits as its factorization.

21004134141247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 34.

Adding to 21004134141247 its reverse (74214143140012), we get a palindrome (95218277281259).

The spelling of 21004134141247 in words is "twenty-one trillion, four billion, one hundred thirty-four million, one hundred forty-one thousand, two hundred forty-seven".