221401228 has 6 divisors (see below), whose sum is σ = 387452156. Its totient is φ = 110700612.

The previous prime is 221401199. The next prime is 221401261. The reversal of 221401228 is 822104122.

It is a junction number, because it is equal to n+sod(n) for n = 221401199 and 221401208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27675150 + ... + 27675157.

Almost surely, 2^221401228 is an apocalyptic number.

It is an amenable number.

221401228 is a deficient number, since it is larger than the sum of its proper divisors (166050928).

221401228 is a wasteful number, since it uses less digits than its factorization.

221401228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55350311 (or 55350309 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 221401228 is about 14879.5573858902. The cubic root of 221401228 is about 604.9600210360.

The spelling of 221401228 in words is "two hundred twenty-one million, four hundred one thousand, two hundred twenty-eight".