21800270136 has 64 divisors (see below), whose sum is σ = 57834259200. Its totient is φ = 6832990208.

The previous prime is 21800270123. The next prime is 21800270197. The reversal of 21800270136 is 63107200812.

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 15 ways as a sum of consecutive naturals, for example, 302121 + ... + 367256.

It is an arithmetic number, because the mean of its divisors is an integer number (903660300).

Almost surely, 2^21800270136 is an apocalyptic number.

It is an amenable number.

21800270136 is an abundant number, since it is smaller than the sum of its proper divisors (36033989064).

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

21800270136 is a wasteful number, since it uses less digits than its factorization.

21800270136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669468 (or 669464 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

Adding to 21800270136 its reverse (63107200812), we get a palindrome (84907470948).

The spelling of 21800270136 in words is "twenty-one billion, eight hundred million, two hundred seventy thousand, one hundred thirty-six".