21004271869417 has 4 divisors (see below), whose sum is σ = 21257335386000. Its totient is φ = 20751208352836.

The previous prime is 21004271869379. The next prime is 21004271869421. The reversal of 21004271869417 is 71496817240012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21004271869417 - 2¹⁹ = 21004271345129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21004271860417) 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 in 3 ways as a sum of consecutive naturals, for example, 126531758167 + ... + 126531758332.

It is an arithmetic number, because the mean of its divisors is an integer number (5314333846500).

Almost surely, 2^{21004271869417} is an apocalyptic number.

It is an amenable number.

21004271869417 is a deficient number, since it is larger than the sum of its proper divisors (253063516583).

21004271869417 is an equidigital number, since it uses as much as digits as its factorization.

21004271869417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253063516582.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 21004271869417 in words is "twenty-one trillion, four billion, two hundred seventy-one million, eight hundred sixty-nine thousand, four hundred seventeen".