221979148 has 6 divisors (see below), whose sum is σ = 388463516. Its totient is φ = 110989572.

The previous prime is 221979139. The next prime is 221979151. The reversal of 221979148 is 841979122.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27747390 + ... + 27747397.

Almost surely, 2^221979148 is an apocalyptic number.

It is an amenable number.

221979148 is a deficient number, since it is larger than the sum of its proper divisors (166484368).

221979148 is a wasteful number, since it uses less digits than its factorization.

221979148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55494791 (or 55494789 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 221979148 is about 14898.9646620159. The cubic root of 221979148 is about 605.4859361175.

The spelling of 221979148 in words is "two hundred twenty-one million, nine hundred seventy-nine thousand, one hundred forty-eight".