223442621 has 2 divisors, whose sum is σ = 223442622. Its totient is φ = 223442620.

The previous prime is 223442591. The next prime is 223442627. The reversal of 223442621 is 126244322.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170589721 + 52852900 = 13061^2 + 7270^2 .

It is a cyclic number.

It is not a de Polignac number, because 223442621 - 2²² = 219248317 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223442627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111721310 + 111721311.

It is an arithmetic number, because the mean of its divisors is an integer number (111721311).

Almost surely, 2^223442621 is an apocalyptic number.

It is an amenable number.

223442621 is a deficient number, since it is larger than the sum of its proper divisors (1).

223442621 is an equidigital number, since it uses as much as digits as its factorization.

223442621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 26.

The square root of 223442621 is about 14947.9972237086. The cubic root of 223442621 is about 606.8136465449.

Adding to 223442621 its reverse (126244322), we get a palindrome (349686943).

The spelling of 223442621 in words is "two hundred twenty-three million, four hundred forty-two thousand, six hundred twenty-one".