21230818539600 has 120 divisors (see below), whose sum is σ = 72009941068800. Its totient is φ = 5328519157760.

The previous prime is 21230818539571. The next prime is 21230818539631. The reversal of 21230818539600 is 693581803212.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-5 number, since 5×21230818539600⁵ (a number of 68 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 21230818539600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 520342800 + ... + 520383599.

It is an arithmetic number, because the mean of its divisors is an integer number (600082842240).

Almost surely, 2^{21230818539600} is an apocalyptic number.

21230818539600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230818539600 is an abundant number, since it is smaller than the sum of its proper divisors (50779122529200).

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

21230818539600 is a wasteful number, since it uses less digits than its factorization.

21230818539600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040726437 (or 1040726426 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 21230818539600 in words is "twenty-one trillion, two hundred thirty billion, eight hundred eighteen million, five hundred thirty-nine thousand, six hundred".