21146004587 has 2 divisors, whose sum is σ = 21146004588. Its totient is φ = 21146004586.

The previous prime is 21146004553. The next prime is 21146004599. The reversal of 21146004587 is 78540064112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21146004587 - 2⁸ = 21146004331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21146004587.

It is not a weakly prime, because it can be changed into another prime (21146004287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10573002293 + 10573002294.

It is an arithmetic number, because the mean of its divisors is an integer number (10573002294).

Almost surely, 2^21146004587 is an apocalyptic number.

21146004587 is a deficient number, since it is larger than the sum of its proper divisors (1).

21146004587 is an equidigital number, since it uses as much as digits as its factorization.

21146004587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

Adding to 21146004587 its reverse (78540064112), we get a palindrome (99686068699).

The spelling of 21146004587 in words is "twenty-one billion, one hundred forty-six million, four thousand, five hundred eighty-seven".