21130364608 has 56 divisors (see below), whose sum is σ = 44501068224. Its totient is φ = 9920409600.

The previous prime is 21130364581. The next prime is 21130364617. The reversal of 21130364608 is 80646303112.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

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 7 ways as a sum of consecutive naturals, for example, 446398 + ... + 491458.

Almost surely, 2^21130364608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21130364608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22250534112).

21130364608 is an abundant number, since it is smaller than the sum of its proper divisors (23370703616).

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

21130364608 is a wasteful number, since it uses less digits than its factorization.

21130364608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45521 (or 45511 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 21130364608 in words is "twenty-one billion, one hundred thirty million, three hundred sixty-four thousand, six hundred eight".