21164163650 has 96 divisors (see below), whose sum is σ = 48006629760. Its totient is φ = 6780049920.

The previous prime is 21164163649. The next prime is 21164163677. The reversal of 21164163650 is 5636146112.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 21164163650.

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 47 ways as a sum of consecutive naturals, for example, 463652 + ... + 507248.

It is an arithmetic number, because the mean of its divisors is an integer number (500069060).

Almost surely, 2^21164163650 is an apocalyptic number.

21164163650 is an abundant number, since it is smaller than the sum of its proper divisors (26842466110).

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

21164163650 is a wasteful number, since it uses less digits than its factorization.

21164163650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43708 (or 43703 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 21164163650 in words is "twenty-one billion, one hundred sixty-four million, one hundred sixty-three thousand, six hundred fifty".