21044217650 has 48 divisors (see below), whose sum is σ = 39402478080. Its totient is φ = 8361854400.

The previous prime is 21044217613. The next prime is 21044217709. The reversal of 21044217650 is 5671244012.

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 23 ways as a sum of consecutive naturals, for example, 10589957 + ... + 10591943.

It is an arithmetic number, because the mean of its divisors is an integer number (820884960).

Almost surely, 2^21044217650 is an apocalyptic number.

21044217650 is a deficient number, since it is larger than the sum of its proper divisors (18358260430).

21044217650 is a wasteful number, since it uses less digits than its factorization.

21044217650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299 (or 3294 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The spelling of 21044217650 in words is "twenty-one billion, forty-four million, two hundred seventeen thousand, six hundred fifty".