21364171571775 has 96 divisors (see below), whose sum is σ = 37228754350080. Its totient is φ = 10780720704000.

The previous prime is 21364171571773. The next prime is 21364171571779. The reversal of 21364171571775 is 57717517146312.

It is not a de Polignac number, because 21364171571775 - 2¹ = 21364171571773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364171571773) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6300255330 + ... + 6300258720.

It is an arithmetic number, because the mean of its divisors is an integer number (387799524480).

Almost surely, 2^{21364171571775} is an apocalyptic number.

21364171571775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21364171571775 is a deficient number, since it is larger than the sum of its proper divisors (15864582778305).

21364171571775 is a wasteful number, since it uses less digits than its factorization.

21364171571775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7777 (or 7772 counting only the distinct ones).

The product of its digits is 8643600, while the sum is 57.

The spelling of 21364171571775 in words is "twenty-one trillion, three hundred sixty-four billion, one hundred seventy-one million, five hundred seventy-one thousand, seven hundred seventy-five".