221721886668 has 48 divisors (see below), whose sum is σ = 518140012544. Its totient is φ = 73794672000.

The previous prime is 221721886643. The next prime is 221721886699. The reversal of 221721886668 is 866688127122.

It is a super-2 number, since 2×221721886668² (a number of 23 digits) contains 22 as substring.

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, 34820421 + ... + 34826787.

Almost surely, 2^221721886668 is an apocalyptic number.

It is an amenable number.

221721886668 is an abundant number, since it is smaller than the sum of its proper divisors (296418125876).

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

221721886668 is a wasteful number, since it uses less digits than its factorization.

221721886668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10342 (or 10340 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 57.

The spelling of 221721886668 in words is "two hundred twenty-one billion, seven hundred twenty-one million, eight hundred eighty-six thousand, six hundred sixty-eight".