221310013 has 4 divisors (see below), whose sum is σ = 224938108. Its totient is φ = 217681920.

The previous prime is 221309989. The next prime is 221310031. The reversal of 221310013 is 310013122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66879684 + 154430329 = 8178^2 + 12427^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221310013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221309975 and 221310002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221310083) 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, 1813956 + ... + 1814077.

It is an arithmetic number, because the mean of its divisors is an integer number (56234527).

Almost surely, 2^221310013 is an apocalyptic number.

It is an amenable number.

221310013 is a deficient number, since it is larger than the sum of its proper divisors (3628095).

221310013 is an equidigital number, since it uses as much as digits as its factorization.

221310013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628094.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 221310013 is about 14876.4919587919. The cubic root of 221310013 is about 604.8769305482.

Adding to 221310013 its reverse (310013122), we get a palindrome (531323135).

The spelling of 221310013 in words is "two hundred twenty-one million, three hundred ten thousand, thirteen".