21361685750 has 128 divisors (see below), whose sum is σ = 44942376960. Its totient is φ = 7555161600.

The previous prime is 21361685743. The next prime is 21361685759. The reversal of 21361685750 is 5758616312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361685759) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 10254209 + ... + 10256291.

It is an arithmetic number, because the mean of its divisors is an integer number (351112320).

Almost surely, 2^21361685750 is an apocalyptic number.

21361685750 is an abundant number, since it is smaller than the sum of its proper divisors (23580691210).

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

21361685750 is a wasteful number, since it uses less digits than its factorization.

21361685750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263 (or 2253 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 21361685750 in words is "twenty-one billion, three hundred sixty-one million, six hundred eighty-five thousand, seven hundred fifty".