221442243 has 8 divisors (see below), whose sum is σ = 322097856. Its totient is φ = 134207400.

The previous prime is 221442227. The next prime is 221442253. The reversal of 221442243 is 342244122.

221442243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221442243 - 2⁴ = 221442227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221442253) 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, 3355153 + ... + 3355218.

It is an arithmetic number, because the mean of its divisors is an integer number (40262232).

Almost surely, 2^221442243 is an apocalyptic number.

221442243 is a deficient number, since it is larger than the sum of its proper divisors (100655613).

221442243 is a wasteful number, since it uses less digits than its factorization.

221442243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6710385.

The product of its digits is 3072, while the sum is 24.

The square root of 221442243 is about 14880.9355552667. The cubic root of 221442243 is about 604.9973753956.

Adding to 221442243 its reverse (342244122), we get a palindrome (563686365).

The spelling of 221442243 in words is "two hundred twenty-one million, four hundred forty-two thousand, two hundred forty-three".