221242673 has 8 divisors (see below), whose sum is σ = 223136448. Its totient is φ = 219355344.

The previous prime is 221242667. The next prime is 221242687. The reversal of 221242673 is 376242122.

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 221242673 - 2¹⁴ = 221226289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221242613) 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, 87140 + ... + 89642.

It is an arithmetic number, because the mean of its divisors is an integer number (27892056).

Almost surely, 2^221242673 is an apocalyptic number.

It is an amenable number.

221242673 is a deficient number, since it is larger than the sum of its proper divisors (1893775).

221242673 is a wasteful number, since it uses less digits than its factorization.

221242673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223.

The product of its digits is 8064, while the sum is 29.

The square root of 221242673 is about 14874.2284841937. The cubic root of 221242673 is about 604.8155738658.

Adding to 221242673 its reverse (376242122), we get a palindrome (597484795).

The spelling of 221242673 in words is "two hundred twenty-one million, two hundred forty-two thousand, six hundred seventy-three".