221220043 has 8 divisors (see below), whose sum is σ = 243820080. Its totient is φ = 199034880.

The previous prime is 221220037. The next prime is 221220067. The reversal of 221220043 is 340022122.

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

It is not a de Polignac number, because 221220043 - 2¹⁷ = 221088971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221219999 and 221220026.

It is not an unprimeable number, because it can be changed into a prime (221220143) 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, 102598 + ... + 104731.

It is an arithmetic number, because the mean of its divisors is an integer number (30477510).

Almost surely, 2^221220043 is an apocalyptic number.

221220043 is a deficient number, since it is larger than the sum of its proper divisors (22600037).

221220043 is a wasteful number, since it uses less digits than its factorization.

221220043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207437.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 221220043 is about 14873.4677530158. The cubic root of 221220043 is about 604.7949517996.

Adding to 221220043 its reverse (340022122), we get a palindrome (561242165).

The spelling of 221220043 in words is "two hundred twenty-one million, two hundred twenty thousand, forty-three".