221394556 has 12 divisors (see below), whose sum is σ = 391062168. Its totient is φ = 109662512.

The previous prime is 221394541. The next prime is 221394557. The reversal of 221394556 is 655493122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221394557) 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, 258211 + ... + 259066.

It is an arithmetic number, because the mean of its divisors is an integer number (32588514).

Almost surely, 2^221394556 is an apocalyptic number.

It is an amenable number.

221394556 is a deficient number, since it is larger than the sum of its proper divisors (169667612).

221394556 is a wasteful number, since it uses less digits than its factorization.

221394556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517388 (or 517386 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 221394556 is about 14879.3331839838. Note that the first 3 decimals coincide. The cubic root of 221394556 is about 604.9539440842.

It can be divided in two parts, 2213 and 94556, that added together give a palindrome (96769).

The spelling of 221394556 in words is "two hundred twenty-one million, three hundred ninety-four thousand, five hundred fifty-six".