221223445 has 8 divisors (see below), whose sum is σ = 265548600. Its totient is φ = 176925120.

The previous prime is 221223421. The next prime is 221223451. The reversal of 221223445 is 544322122.

It can be written as a sum of positive squares in 4 ways, for example, as 47458321 + 173765124 = 6889^2 + 13182^2 .

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

It is not a de Polignac number, because 221223445 - 2¹¹ = 221221397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25531 + ... + 33079.

It is an arithmetic number, because the mean of its divisors is an integer number (33193575).

Almost surely, 2^221223445 is an apocalyptic number.

It is an amenable number.

221223445 is a deficient number, since it is larger than the sum of its proper divisors (44325155).

221223445 is an equidigital number, since it uses as much as digits as its factorization.

221223445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13415.

The product of its digits is 3840, while the sum is 25.

The square root of 221223445 is about 14873.5821172978. The cubic root of 221223445 is about 604.7980520339.

Adding to 221223445 its reverse (544322122), we get a palindrome (765545567).

The spelling of 221223445 in words is "two hundred twenty-one million, two hundred twenty-three thousand, four hundred forty-five".