21718722050 has 48 divisors (see below), whose sum is σ = 42293543040. Its totient is φ = 8286815040.

The previous prime is 21718722031. The next prime is 21718722059. The reversal of 21718722050 is 5022781712.

It is a self number, because there is not a number n which added to its sum of digits gives 21718722050.

It is not an unprimeable number, because it can be changed into a prime (21718722059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30119 + ... + 210581.

It is an arithmetic number, because the mean of its divisors is an integer number (881115480).

Almost surely, 2^21718722050 is an apocalyptic number.

21718722050 is a deficient number, since it is larger than the sum of its proper divisors (20574820990).

21718722050 is a wasteful number, since it uses less digits than its factorization.

21718722050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180587 (or 180582 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 35.

The spelling of 21718722050 in words is "twenty-one billion, seven hundred eighteen million, seven hundred twenty-two thousand, fifty".