21347004016787 has 2 divisors, whose sum is σ = 21347004016788. Its totient is φ = 21347004016786.

The previous prime is 21347004016783. The next prime is 21347004016847. The reversal of 21347004016787 is 78761040074312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21347004016787 - 2² = 21347004016783 is a prime.

It is not a weakly prime, because it can be changed into another prime (21347004016783) 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, 10673502008393 + 10673502008394.

It is an arithmetic number, because the mean of its divisors is an integer number (10673502008394).

Almost surely, 2^{21347004016787} is an apocalyptic number.

21347004016787 is a deficient number, since it is larger than the sum of its proper divisors (1).

21347004016787 is an equidigital number, since it uses as much as digits as its factorization.

21347004016787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 21347004016787 in words is "twenty-one trillion, three hundred forty-seven billion, four million, sixteen thousand, seven hundred eighty-seven".