221346554 has 16 divisors (see below), whose sum is σ = 390065760. Its totient is φ = 92872560.

The previous prime is 221346553. The next prime is 221346571. The reversal of 221346554 is 455643122.

It is a self number, because there is not a number n which added to its sum of digits gives 221346554.

It is not an unprimeable number, because it can be changed into a prime (221346553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386684 + ... + 387255.

It is an arithmetic number, because the mean of its divisors is an integer number (24379110).

Almost surely, 2^221346554 is an apocalyptic number.

221346554 is a deficient number, since it is larger than the sum of its proper divisors (168719206).

221346554 is a wasteful number, since it uses less digits than its factorization.

221346554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773965.

The product of its digits is 28800, while the sum is 32.

The square root of 221346554 is about 14877.7200538255. The cubic root of 221346554 is about 604.9102195851.

Adding to 221346554 its reverse (455643122), we get a palindrome (676989676).

The spelling of 221346554 in words is "two hundred twenty-one million, three hundred forty-six thousand, five hundred fifty-four".