21782218222 has 8 divisors (see below), whose sum is σ = 34392976200. Its totient is φ = 10317892824.

The previous prime is 21782218189. The next prime is 21782218229. The reversal of 21782218222 is 22281228712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21782218229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286608097 + ... + 286608172.

It is an arithmetic number, because the mean of its divisors is an integer number (4299122025).

Almost surely, 2^21782218222 is an apocalyptic number.

21782218222 is a deficient number, since it is larger than the sum of its proper divisors (12610757978).

21782218222 is a wasteful number, since it uses less digits than its factorization.

21782218222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573216290.

The product of its digits is 28672, while the sum is 37.

The spelling of 21782218222 in words is "twenty-one billion, seven hundred eighty-two million, two hundred eighteen thousand, two hundred twenty-two".