21730809510 has 48 divisors (see below), whose sum is σ = 56508759216. Its totient is φ = 5793994944.

The previous prime is 21730809497. The next prime is 21730809517. The reversal of 21730809510 is 1590803712.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21730809517) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 747772 + ... + 776288.

It is an arithmetic number, because the mean of its divisors is an integer number (1177265817).

Almost surely, 2^21730809510 is an apocalyptic number.

21730809510 is an abundant number, since it is smaller than the sum of its proper divisors (34777949706).

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

21730809510 is a wasteful number, since it uses less digits than its factorization.

21730809510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36997 (or 36994 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 21730809510 in words is "twenty-one billion, seven hundred thirty million, eight hundred nine thousand, five hundred ten".