21655030326 has 16 divisors (see below), whose sum is σ = 43600734000. Its totient is φ = 7169897888.

The previous prime is 21655030291. The next prime is 21655030333. The reversal of 21655030326 is 62303055612.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 12110421 + ... + 12112208.

It is an arithmetic number, because the mean of its divisors is an integer number (2725045875).

Almost surely, 2^21655030326 is an apocalyptic number.

21655030326 is an abundant number, since it is smaller than the sum of its proper divisors (21945703674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21655030326 is a wasteful number, since it uses less digits than its factorization.

21655030326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24222783.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 21655030326 its reverse (62303055612), we get a palindrome (83958085938).

The spelling of 21655030326 in words is "twenty-one billion, six hundred fifty-five million, thirty thousand, three hundred twenty-six".