21214036536487 has 2 divisors, whose sum is σ = 21214036536488. Its totient is φ = 21214036536486.

The previous prime is 21214036536449. The next prime is 21214036536493. The reversal of 21214036536487 is 78463563041212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21214036536487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21214036516487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607018268243 + 10607018268244.

It is an arithmetic number, because the mean of its divisors is an integer number (10607018268244).

Almost surely, 2^{21214036536487} is an apocalyptic number.

21214036536487 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214036536487 is an equidigital number, since it uses as much as digits as its factorization.

21214036536487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 52.

Adding to 21214036536487 its reverse (78463563041212), we get a palindrome (99677599577699).

The spelling of 21214036536487 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, four hundred eighty-seven".