221223245 has 8 divisors (see below), whose sum is σ = 265557984. Its totient is φ = 176918544.

The previous prime is 221223241. The next prime is 221223253. The reversal of 221223245 is 542322122.

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 221223245 - 2² = 221223241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221223245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223241) 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, 14642 + ... + 25628.

It is an arithmetic number, because the mean of its divisors is an integer number (33194748).

Almost surely, 2^221223245 is an apocalyptic number.

It is an amenable number.

221223245 is a deficient number, since it is larger than the sum of its proper divisors (44334739).

221223245 is a wasteful number, since it uses less digits than its factorization.

221223245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15019.

The product of its digits is 1920, while the sum is 23.

The square root of 221223245 is about 14873.5753939663. The cubic root of 221223245 is about 604.7978697753.

Adding to 221223245 its reverse (542322122), we get a palindrome (763545367).

The spelling of 221223245 in words is "two hundred twenty-one million, two hundred twenty-three thousand, two hundred forty-five".