221720719068 has 30 divisors (see below), whose sum is σ = 579621757176. Its totient is φ = 73906906248.

The previous prime is 221720719061. The next prime is 221720719069. The reversal of 221720719068 is 860917027122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221720719061) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 342161280 + ... + 342161927.

Almost surely, 2^221720719068 is an apocalyptic number.

It is an amenable number.

221720719068 is an abundant number, since it is smaller than the sum of its proper divisors (357901038108).

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

221720719068 is a wasteful number, since it uses less digits than its factorization.

221720719068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684323223 (or 684323212 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 221720719068 in words is "two hundred twenty-one billion, seven hundred twenty million, seven hundred nineteen thousand, sixty-eight".