221920740816 has 80 divisors (see below), whose sum is σ = 578673629184. Its totient is φ = 73281341952.

The previous prime is 221920740809. The next prime is 221920740863. The reversal of 221920740816 is 618047029122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4100106 + ... + 4153878.

Almost surely, 2^221920740816 is an apocalyptic number.

It is an amenable number.

221920740816 is an abundant number, since it is smaller than the sum of its proper divisors (356752888368).

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

221920740816 is a wasteful number, since it uses less digits than its factorization.

221920740816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54588 (or 54582 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

Adding to 221920740816 its reverse (618047029122), we get a palindrome (839967769938).

The spelling of 221920740816 in words is "two hundred twenty-one billion, nine hundred twenty million, seven hundred forty thousand, eight hundred sixteen".