221121313 has 8 divisors (see below), whose sum is σ = 252824000. Its totient is φ = 189447120.

The previous prime is 221121293. The next prime is 221121343. The reversal of 221121313 is 313121122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221121313 - 2⁵ = 221121281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221121343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13498 + ... + 24988.

It is an arithmetic number, because the mean of its divisors is an integer number (31603000).

Almost surely, 2^221121313 is an apocalyptic number.

It is an amenable number.

221121313 is a deficient number, since it is larger than the sum of its proper divisors (31702687).

221121313 is a wasteful number, since it uses less digits than its factorization.

221121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14247.

The product of its digits is 72, while the sum is 16.

The square root of 221121313 is about 14870.1483852717. The cubic root of 221121313 is about 604.7049655428.

Adding to 221121313 its reverse (313121122), we get a palindrome (534242435).

The spelling of 221121313 in words is "two hundred twenty-one million, one hundred twenty-one thousand, three hundred thirteen".