21764943573 has 4 divisors (see below), whose sum is σ = 29019924768. Its totient is φ = 14509962380.

The previous prime is 21764943553. The next prime is 21764943623. The reversal of 21764943573 is 37534946712.

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 21764943573 - 2¹⁷ = 21764812501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21764943523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3627490593 + ... + 3627490598.

It is an arithmetic number, because the mean of its divisors is an integer number (7254981192).

Almost surely, 2^21764943573 is an apocalyptic number.

It is an amenable number.

21764943573 is a deficient number, since it is larger than the sum of its proper divisors (7254981195).

21764943573 is an equidigital number, since it uses as much as digits as its factorization.

21764943573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7254981194.

The product of its digits is 3810240, while the sum is 51.

The spelling of 21764943573 in words is "twenty-one billion, seven hundred sixty-four million, nine hundred forty-three thousand, five hundred seventy-three".