221660510672 has 20 divisors (see below), whose sum is σ = 436746347040. Its totient is φ = 108951775968.

The previous prime is 221660510653. The next prime is 221660510693. The reversal of 221660510672 is 276015066122.

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, 117403988 + ... + 117405875.

It is an arithmetic number, because the mean of its divisors is an integer number (21837317352).

Almost surely, 2^221660510672 is an apocalyptic number.

It is an amenable number.

221660510672 is a deficient number, since it is larger than the sum of its proper divisors (215085836368).

221660510672 is a wasteful number, since it uses less digits than its factorization.

221660510672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234809930 (or 234809924 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

Adding to 221660510672 its reverse (276015066122), we get a palindrome (497675576794).

The spelling of 221660510672 in words is "two hundred twenty-one billion, six hundred sixty million, five hundred ten thousand, six hundred seventy-two".