221311013 has 8 divisors (see below), whose sum is σ = 275920320. Its totient is φ = 172450080.

The previous prime is 221311009. The next prime is 221311039. The reversal of 221311013 is 310113122.

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

It is not a de Polignac number, because 221311013 - 2² = 221311009 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 (221311003) 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, 1437008 + ... + 1437161.

It is an arithmetic number, because the mean of its divisors is an integer number (34490040).

Almost surely, 2^221311013 is an apocalyptic number.

It is an amenable number.

221311013 is a deficient number, since it is larger than the sum of its proper divisors (54609307).

221311013 is a wasteful number, since it uses less digits than its factorization.

221311013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874187.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 221311013 is about 14876.5255688282. The cubic root of 221311013 is about 604.8778416020.

Adding to 221311013 its reverse (310113122), we get a palindrome (531424135).

The spelling of 221311013 in words is "two hundred twenty-one million, three hundred eleven thousand, thirteen".