221221313013 has 8 divisors (see below), whose sum is σ = 294964269376. Its totient is φ = 147479616000.

The previous prime is 221221312999. The next prime is 221221313017. The reversal of 221221313013 is 310313122122.

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

It is not a de Polignac number, because 221221313013 - 2¹⁶ = 221221247477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221313017) 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, 229488 + ... + 703638.

It is an arithmetic number, because the mean of its divisors is an integer number (36870533672).

Almost surely, 2^221221313013 is an apocalyptic number.

It is an amenable number.

221221313013 is a deficient number, since it is larger than the sum of its proper divisors (73742956363).

221221313013 is a wasteful number, since it uses less digits than its factorization.

221221313013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629675.

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

Adding to 221221313013 its reverse (310313122122), we get a palindrome (531534435135).

The spelling of 221221313013 in words is "two hundred twenty-one billion, two hundred twenty-one million, three hundred thirteen thousand, thirteen".