21374326421705 has 4 divisors (see below), whose sum is σ = 25649191706052. Its totient is φ = 17099461137360.

The previous prime is 21374326421687. The next prime is 21374326421711. The reversal of 21374326421705 is 50712462347312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3506222545081 + 17868103876624 = 1872491^2 + 4227068^2 .

It is not a de Polignac number, because 21374326421705 - 2⁶ = 21374326421641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21374326421705.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2137432642166 + ... + 2137432642175.

It is an arithmetic number, because the mean of its divisors is an integer number (6412297926513).

Almost surely, 2^{21374326421705} is an apocalyptic number.

It is an amenable number.

21374326421705 is a deficient number, since it is larger than the sum of its proper divisors (4274865284347).

21374326421705 is an equidigital number, since it uses as much as digits as its factorization.

21374326421705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4274865284346.

The product of its (nonzero) digits is 1693440, while the sum is 47.

The spelling of 21374326421705 in words is "twenty-one trillion, three hundred seventy-four billion, three hundred twenty-six million, four hundred twenty-one thousand, seven hundred five".