221223461 has 4 divisors (see below), whose sum is σ = 221514924. Its totient is φ = 220932000.

The previous prime is 221223451. The next prime is 221223467. The reversal of 221223461 is 164322122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 76020961 + 145202500 = 8719^2 + 12050^2 .

It is a cyclic number.

It is not a de Polignac number, because 221223461 - 2¹⁰ = 221222437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144590 + ... + 146111.

It is an arithmetic number, because the mean of its divisors is an integer number (55378731).

Almost surely, 2^221223461 is an apocalyptic number.

It is an amenable number.

221223461 is a deficient number, since it is larger than the sum of its proper divisors (291463).

221223461 is an equidigital number, since it uses as much as digits as its factorization.

221223461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291462.

The product of its digits is 1152, while the sum is 23.

The square root of 221223461 is about 14873.5826551642. The cubic root of 221223461 is about 604.7980666146.

Adding to 221223461 its reverse (164322122), we get a palindrome (385545583).

The spelling of 221223461 in words is "two hundred twenty-one million, two hundred twenty-three thousand, four hundred sixty-one".