21552335723 has 4 divisors (see below), whose sum is σ = 21552657720. Its totient is φ = 21552013728.

The previous prime is 21552335689. The next prime is 21552335731. The reversal of 21552335723 is 32753325512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21552335723 is a prime.

It is a super-3 number, since 3×21552335723³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21552335023) 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, 18638 + ... + 208451.

It is an arithmetic number, because the mean of its divisors is an integer number (5388164430).

Almost surely, 2^21552335723 is an apocalyptic number.

21552335723 is a deficient number, since it is larger than the sum of its proper divisors (321997).

21552335723 is an equidigital number, since it uses as much as digits as its factorization.

21552335723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321996.

The product of its digits is 189000, while the sum is 38.

The spelling of 21552335723 in words is "twenty-one billion, five hundred fifty-two million, three hundred thirty-five thousand, seven hundred twenty-three".