221321273 has 2 divisors, whose sum is σ = 221321274. Its totient is φ = 221321272.

The previous prime is 221321267. The next prime is 221321279. The reversal of 221321273 is 372123122.

It is a balanced prime because it is at equal distance from previous prime (221321267) and next prime (221321279).

It can be written as a sum of positive squares in only one way, i.e., 111239209 + 110082064 = 10547^2 + 10492^2 .

It is a cyclic number.

It is not a de Polignac number, because 221321273 - 2⁶ = 221321209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221321279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660636 + 110660637.

It is an arithmetic number, because the mean of its divisors is an integer number (110660637).

Almost surely, 2^221321273 is an apocalyptic number.

It is an amenable number.

221321273 is a deficient number, since it is larger than the sum of its proper divisors (1).

221321273 is an equidigital number, since it uses as much as digits as its factorization.

221321273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 23.

The square root of 221321273 is about 14876.8704034148. The cubic root of 221321273 is about 604.8871888560.

Adding to 221321273 its reverse (372123122), we get a palindrome (593444395).

The spelling of 221321273 in words is "two hundred twenty-one million, three hundred twenty-one thousand, two hundred seventy-three".