221221454 has 16 divisors (see below), whose sum is σ = 343645200. Its totient is φ = 106681344.

The previous prime is 221221447. The next prime is 221221457. The reversal of 221221454 is 454122122.

221221454 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80369 + ... + 83075.

It is an arithmetic number, because the mean of its divisors is an integer number (21477825).

Almost surely, 2^221221454 is an apocalyptic number.

221221454 is a deficient number, since it is larger than the sum of its proper divisors (122423746).

221221454 is a wasteful number, since it uses less digits than its factorization.

221221454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4147.

The product of its digits is 1280, while the sum is 23.

The square root of 221221454 is about 14873.5151863976. The cubic root of 221221454 is about 604.7962376443.

Adding to 221221454 its reverse (454122122), we get a palindrome (675343576).

The spelling of 221221454 in words is "two hundred twenty-one million, two hundred twenty-one thousand, four hundred fifty-four".