21277775323 has 4 divisors (see below), whose sum is σ = 24317457520. Its totient is φ = 18238093128.

The previous prime is 21277775317. The next prime is 21277775357. The reversal of 21277775323 is 32357777212.

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-21277775323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21277775923) 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, 1519841088 + ... + 1519841101.

It is an arithmetic number, because the mean of its divisors is an integer number (6079364380).

Almost surely, 2^21277775323 is an apocalyptic number.

21277775323 is a deficient number, since it is larger than the sum of its proper divisors (3039682197).

21277775323 is an equidigital number, since it uses as much as digits as its factorization.

21277775323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039682196.

The product of its digits is 864360, while the sum is 46.

The spelling of 21277775323 in words is "twenty-one billion, two hundred seventy-seven million, seven hundred seventy-five thousand, three hundred twenty-three".