21812310655 has 8 divisors (see below), whose sum is σ = 26341492032. Its totient is φ = 17338702368.

The previous prime is 21812310629. The next prime is 21812310673. The reversal of 21812310655 is 55601321812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21812310655 is a prime.

It is a super-3 number, since 3×21812310655³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21812310655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13892407 + ... + 13893976.

It is an arithmetic number, because the mean of its divisors is an integer number (3292686504).

Almost surely, 2^21812310655 is an apocalyptic number.

21812310655 is a deficient number, since it is larger than the sum of its proper divisors (4529181377).

21812310655 is a wasteful number, since it uses less digits than its factorization.

21812310655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27786545.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 21812310655 in words is "twenty-one billion, eight hundred twelve million, three hundred ten thousand, six hundred fifty-five".