221241455 has 8 divisors (see below), whose sum is σ = 271138752. Its totient is φ = 173227168.

The previous prime is 221241403. The next prime is 221241479. The reversal of 221241455 is 554142122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221241455 - 2¹⁶ = 221175919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 470492 + ... + 470961.

It is an arithmetic number, because the mean of its divisors is an integer number (33892344).

Almost surely, 2^221241455 is an apocalyptic number.

221241455 is a deficient number, since it is larger than the sum of its proper divisors (49897297).

221241455 is an equidigital number, since it uses as much as digits as its factorization.

221241455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941505.

The product of its digits is 3200, while the sum is 26.

The square root of 221241455 is about 14874.1875408373. The cubic root of 221241455 is about 604.8144639733.

Adding to 221241455 its reverse (554142122), we get a palindrome (775383577).

The spelling of 221241455 in words is "two hundred twenty-one million, two hundred forty-one thousand, four hundred fifty-five".