221321267 has 2 divisors, whose sum is σ = 221321268. Its totient is φ = 221321266.

The previous prime is 221321251. The next prime is 221321273. The reversal of 221321267 is 762123122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221321267 - 2⁴ = 221321251 is a prime.

It is not a weakly prime, because it can be changed into another prime (221321297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660633 + 110660634.

It is an arithmetic number, because the mean of its divisors is an integer number (110660634).

Almost surely, 2^221321267 is an apocalyptic number.

221321267 is a deficient number, since it is larger than the sum of its proper divisors (1).

221321267 is an equidigital number, since it uses as much as digits as its factorization.

221321267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 221321267 is about 14876.8702017595. The cubic root of 221321267 is about 604.8871833899.

Adding to 221321267 its reverse (762123122), we get a palindrome (983444389).

The spelling of 221321267 in words is "two hundred twenty-one million, three hundred twenty-one thousand, two hundred sixty-seven".