221822217844 has 12 divisors (see below), whose sum is σ = 388192545664. Its totient is φ = 110910061944.

The previous prime is 221822217839. The next prime is 221822217941. The reversal of 221822217844 is 448712228122.

It is a self number, because there is not a number n which added to its sum of digits gives 221822217844.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401947 + ... + 777949.

Almost surely, 2^221822217844 is an apocalyptic number.

It is an amenable number.

221822217844 is a deficient number, since it is larger than the sum of its proper divisors (166370327820).

221822217844 is a wasteful number, since it uses less digits than its factorization.

221822217844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523494 (or 523492 counting only the distinct ones).

The product of its digits is 229376, while the sum is 43.

The spelling of 221822217844 in words is "two hundred twenty-one billion, eight hundred twenty-two million, two hundred seventeen thousand, eight hundred forty-four".