221554668 has 48 divisors (see below), whose sum is σ = 558897920. Its totient is φ = 68071104.

The previous prime is 221554651. The next prime is 221554691. The reversal of 221554668 is 866455122.

221554668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 4696 + ... + 21567.

Almost surely, 2^221554668 is an apocalyptic number.

It is an amenable number.

221554668 is an abundant number, since it is smaller than the sum of its proper divisors (337343252).

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

221554668 is a wasteful number, since it uses less digits than its factorization.

221554668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26326 (or 26324 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The square root of 221554668 is about 14884.7125602075. The cubic root of 221554668 is about 605.0997426790.

It can be divided in two parts, 221554 and 668, that added together give a palindrome (222222).

The spelling of 221554668 in words is "two hundred twenty-one million, five hundred fifty-four thousand, six hundred sixty-eight".