221455543 has 8 divisors (see below), whose sum is σ = 223848576. Its totient is φ = 219075000.

The previous prime is 221455541. The next prime is 221455561. The reversal of 221455543 is 345554122.

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 221455543 - 2¹ = 221455541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221455541) 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, 34980 + ... + 40822.

It is an arithmetic number, because the mean of its divisors is an integer number (27981072).

Almost surely, 2^221455543 is an apocalyptic number.

221455543 is a deficient number, since it is larger than the sum of its proper divisors (2393033).

221455543 is a wasteful number, since it uses less digits than its factorization.

221455543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6245.

The product of its digits is 24000, while the sum is 31.

The square root of 221455543 is about 14881.3824290622. The cubic root of 221455543 is about 605.0094873635.

The spelling of 221455543 in words is "two hundred twenty-one million, four hundred fifty-five thousand, five hundred forty-three".