221405168 has 40 divisors (see below), whose sum is σ = 440114688. Its totient is φ = 107857152.

The previous prime is 221405147. The next prime is 221405183. The reversal of 221405168 is 861504122.

It is a self number, because there is not a number n which added to its sum of digits gives 221405168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132305 + ... + 133967.

Almost surely, 2^221405168 is an apocalyptic number.

It is an amenable number.

221405168 is a deficient number, since it is larger than the sum of its proper divisors (218709520).

221405168 is a wasteful number, since it uses less digits than its factorization.

221405168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881 (or 1875 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 221405168 is about 14879.6897817125. The cubic root of 221405168 is about 604.9636095863.

The spelling of 221405168 in words is "two hundred twenty-one million, four hundred five thousand, one hundred sixty-eight".