21368835188 has 12 divisors (see below), whose sum is σ = 37399222980. Its totient is φ = 10683342912.

The previous prime is 21368835133. The next prime is 21368835247. The reversal of 21368835188 is 88153886312.

It can be written as a sum of positive squares in 2 ways, for example, as 14175759844 + 7193075344 = 119062^2 + 84812^2 .

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 3 ways as a sum of consecutive naturals, for example, 223073 + ... + 304136.

It is an arithmetic number, because the mean of its divisors is an integer number (3116601915).

Almost surely, 2^21368835188 is an apocalyptic number.

It is an amenable number.

21368835188 is a deficient number, since it is larger than the sum of its proper divisors (16030387792).

21368835188 is a wasteful number, since it uses less digits than its factorization.

21368835188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537346 (or 537344 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 53.

The spelling of 21368835188 in words is "twenty-one billion, three hundred sixty-eight million, eight hundred thirty-five thousand, one hundred eighty-eight".