221411228 has 12 divisors (see below), whose sum is σ = 392927472. Its totient is φ = 109146240.

The previous prime is 221411227. The next prime is 221411231. The reversal of 221411228 is 822114122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221411221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389525 + ... + 390092.

It is an arithmetic number, because the mean of its divisors is an integer number (32743956).

Almost surely, 2^221411228 is an apocalyptic number.

It is an amenable number.

221411228 is a deficient number, since it is larger than the sum of its proper divisors (171516244).

221411228 is a wasteful number, since it uses less digits than its factorization.

221411228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779692 (or 779690 counting only the distinct ones).

The product of its digits is 512, while the sum is 23.

The square root of 221411228 is about 14879.8934135968. The cubic root of 221411228 is about 604.9691289487.

The spelling of 221411228 in words is "two hundred twenty-one million, four hundred eleven thousand, two hundred twenty-eight".