221554043 has 4 divisors (see below), whose sum is σ = 222530280. Its totient is φ = 220577808.

The previous prime is 221554033. The next prime is 221554087. The reversal of 221554043 is 340455122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221554043 - 2¹⁰ = 221553019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221554033) 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, 487778 + ... + 488231.

It is an arithmetic number, because the mean of its divisors is an integer number (55632570).

Almost surely, 2^221554043 is an apocalyptic number.

221554043 is a deficient number, since it is larger than the sum of its proper divisors (976237).

221554043 is an equidigital number, since it uses as much as digits as its factorization.

221554043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976236.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 221554043 is about 14884.6915654978. The cubic root of 221554043 is about 605.0991736883.

The spelling of 221554043 in words is "two hundred twenty-one million, five hundred fifty-four thousand, forty-three".