221302013 has 4 divisors (see below), whose sum is σ = 221359740. Its totient is φ = 221244288.

The previous prime is 221302007. The next prime is 221302033. The reversal of 221302013 is 310203122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310203122 = 2 ⋅155101561.

It can be written as a sum of positive squares in 2 ways, for example, as 167909764 + 53392249 = 12958^2 + 7307^2 .

It is a cyclic number.

It is not a de Polignac number, because 221302013 - 2¹⁸ = 221039869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221302033) 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, 22670 + ... + 30927.

It is an arithmetic number, because the mean of its divisors is an integer number (55339935).

Almost surely, 2^221302013 is an apocalyptic number.

It is an amenable number.

221302013 is a deficient number, since it is larger than the sum of its proper divisors (57727).

221302013 is an equidigital number, since it uses as much as digits as its factorization.

221302013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57726.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221302013 is about 14876.2230757676. The cubic root of 221302013 is about 604.8696420186.

Adding to 221302013 its reverse (310203122), we get a palindrome (531505135).

The spelling of 221302013 in words is "two hundred twenty-one million, three hundred two thousand, thirteen".