221112013 has 4 divisors (see below), whose sum is σ = 234118620. Its totient is φ = 208105408.

The previous prime is 221111983. The next prime is 221112019. The reversal of 221112013 is 310211122.

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 69255684 + 151856329 = 8322^2 + 12323^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221112013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221111984 and 221112002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6503278 + ... + 6503311.

It is an arithmetic number, because the mean of its divisors is an integer number (58529655).

Almost surely, 2^221112013 is an apocalyptic number.

It is an amenable number.

221112013 is a deficient number, since it is larger than the sum of its proper divisors (13006607).

221112013 is a wasteful number, since it uses less digits than its factorization.

221112013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13006606.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 221112013 is about 14869.8356749495. The cubic root of 221112013 is about 604.6964877907.

Adding to 221112013 its reverse (310211122), we get a palindrome (531323135).

The spelling of 221112013 in words is "two hundred twenty-one million, one hundred twelve thousand, thirteen".