221310601 has 2 divisors, whose sum is σ = 221310602. Its totient is φ = 221310600.

The previous prime is 221310599. The next prime is 221310611. The reversal of 221310601 is 106013122.

221310601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193210000 + 28100601 = 13900^2 + 5301^2 .

It is a cyclic number.

It is not a de Polignac number, because 221310601 - 2¹ = 221310599 is a prime.

It is a super-2 number, since 2×221310601² = 97956764229962402, which contains 22 as substring.

Together with 221310599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221310611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110655300 + 110655301.

It is an arithmetic number, because the mean of its divisors is an integer number (110655301).

Almost surely, 2^221310601 is an apocalyptic number.

It is an amenable number.

221310601 is a deficient number, since it is larger than the sum of its proper divisors (1).

221310601 is an equidigital number, since it uses as much as digits as its factorization.

221310601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 221310601 is about 14876.5117215025. The cubic root of 221310601 is about 604.8774662482.

Adding to 221310601 its reverse (106013122), we get a palindrome (327323723).

The spelling of 221310601 in words is "two hundred twenty-one million, three hundred ten thousand, six hundred one".