21765533223 has 8 divisors (see below), whose sum is σ = 33166526848. Its totient is φ = 12437447544.

The previous prime is 21765533203. The next prime is 21765533249. The reversal of 21765533223 is 32233556712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21765533223 - 2⁵ = 21765533191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21765533203) 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 7 ways as a sum of consecutive naturals, for example, 518226961 + ... + 518227002.

It is an arithmetic number, because the mean of its divisors is an integer number (4145815856).

Almost surely, 2^21765533223 is an apocalyptic number.

21765533223 is a deficient number, since it is larger than the sum of its proper divisors (11400993625).

21765533223 is a wasteful number, since it uses less digits than its factorization.

21765533223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036453973.

The product of its digits is 226800, while the sum is 39.

The spelling of 21765533223 in words is "twenty-one billion, seven hundred sixty-five million, five hundred thirty-three thousand, two hundred twenty-three".