221201313 has 4 divisors (see below), whose sum is σ = 294935088. Its totient is φ = 147467540.

The previous prime is 221201261. The next prime is 221201329. The reversal of 221201313 is 313102122.

221201313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221201313 - 2⁹ = 221200801 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221201292 and 221201301.

It is not an unprimeable number, because it can be changed into a prime (221201333) 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, 36866883 + ... + 36866888.

It is an arithmetic number, because the mean of its divisors is an integer number (73733772).

Almost surely, 2^221201313 is an apocalyptic number.

It is an amenable number.

221201313 is a deficient number, since it is larger than the sum of its proper divisors (73733775).

221201313 is an equidigital number, since it uses as much as digits as its factorization.

221201313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73733774.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221201313 is about 14872.8380949972. The cubic root of 221201313 is about 604.7778826272. Note that the first 3 decimals are identical.

Adding to 221201313 its reverse (313102122), we get a palindrome (534303435).

The spelling of 221201313 in words is "two hundred twenty-one million, two hundred one thousand, three hundred thirteen".