221100043 has 4 divisors (see below), whose sum is σ = 222074280. Its totient is φ = 220125808.

The previous prime is 221100041. The next prime is 221100059. The reversal of 221100043 is 340001122.

221100043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221100043 - 2¹ = 221100041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221099996 and 221100032.

It is not an unprimeable number, because it can be changed into a prime (221100041) 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, 486778 + ... + 487231.

It is an arithmetic number, because the mean of its divisors is an integer number (55518570).

Almost surely, 2^221100043 is an apocalyptic number.

221100043 is a deficient number, since it is larger than the sum of its proper divisors (974237).

221100043 is an equidigital number, since it uses as much as digits as its factorization.

221100043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974236.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221100043 is about 14869.4331768228. The cubic root of 221100043 is about 604.6855757534.

Adding to 221100043 its reverse (340001122), we get a palindrome (561101165).

The spelling of 221100043 in words is "two hundred twenty-one million, one hundred thousand, forty-three".