221311232013 has 8 divisors (see below), whose sum is σ = 303056822368. Its totient is φ = 143553231504.

The previous prime is 221311232011. The next prime is 221311232033. The reversal of 221311232013 is 310232113122.

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

It is not a de Polignac number, because 221311232013 - 2¹ = 221311232011 is a prime.

It is a super-2 number, since 2×221311232013² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221311232011) 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, 996897331 + ... + 996897552.

It is an arithmetic number, because the mean of its divisors is an integer number (37882102796).

Almost surely, 2^221311232013 is an apocalyptic number.

It is an amenable number.

221311232013 is a deficient number, since it is larger than the sum of its proper divisors (81745590355).

221311232013 is a wasteful number, since it uses less digits than its factorization.

221311232013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993794923.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 221311232013 its reverse (310232113122), we get a palindrome (531543345135).

The spelling of 221311232013 in words is "two hundred twenty-one billion, three hundred eleven million, two hundred thirty-two thousand, thirteen".