21471350474705 has 16 divisors (see below), whose sum is σ = 25772634292944. Its totient is φ = 17172405181440.

The previous prime is 21471350474689. The next prime is 21471350474759. The reversal of 21471350474705 is 50747405317412.

It can be written as a sum of positive squares in 8 ways, for example, as 1149295490704 + 20322054984001 = 1072052^2 + 4507999^2 .

It is not a de Polignac number, because 21471350474705 - 2⁴ = 21471350474689 is a prime.

It is a super-2 number, since 2×21471350474705² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 367674989 + ... + 367733381.

It is an arithmetic number, because the mean of its divisors is an integer number (1610789643309).

Almost surely, 2^{21471350474705} is an apocalyptic number.

It is an amenable number.

21471350474705 is a deficient number, since it is larger than the sum of its proper divisors (4301283818239).

21471350474705 is a wasteful number, since it uses less digits than its factorization.

21471350474705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77156.

The product of its (nonzero) digits is 3292800, while the sum is 50.

The spelling of 21471350474705 in words is "twenty-one trillion, four hundred seventy-one billion, three hundred fifty million, four hundred seventy-four thousand, seven hundred five".