221022313 has 4 divisors (see below), whose sum is σ = 221882580. Its totient is φ = 220162048.

The previous prime is 221022293. The next prime is 221022323. The reversal of 221022313 is 313220122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313220122 = 2 ⋅156610061.

It can be written as a sum of positive squares in 2 ways, for example, as 179908569 + 41113744 = 13413^2 + 6412^2 .

It is a cyclic number.

It is not a de Polignac number, because 221022313 - 2¹³ = 221014121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221022323) 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, 429748 + ... + 430261.

It is an arithmetic number, because the mean of its divisors is an integer number (55470645).

Almost surely, 2^221022313 is an apocalyptic number.

It is an amenable number.

221022313 is a deficient number, since it is larger than the sum of its proper divisors (860267).

221022313 is an equidigital number, since it uses as much as digits as its factorization.

221022313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860266.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221022313 is about 14866.8191957796. The cubic root of 221022313 is about 604.6147062980.

Adding to 221022313 its reverse (313220122), we get a palindrome (534242435).

The spelling of 221022313 in words is "two hundred twenty-one million, twenty-two thousand, three hundred thirteen".