21313232132221 has 8 divisors (see below), whose sum is σ = 21346635508704. Its totient is φ = 21279854764560.

The previous prime is 21313232132147. The next prime is 21313232132243. The reversal of 21313232132221 is 12223123231312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21313232132221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21313232132221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313232132251) 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, 4861675 + ... + 8140168.

It is an arithmetic number, because the mean of its divisors is an integer number (2668329438588).

Almost surely, 2^{21313232132221} is an apocalyptic number.

It is an amenable number.

21313232132221 is a deficient number, since it is larger than the sum of its proper divisors (33403376483).

21313232132221 is a wasteful number, since it uses less digits than its factorization.

21313232132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13004411.

The product of its digits is 5184, while the sum is 28.

Adding to 21313232132221 its reverse (12223123231312), we get a palindrome (33536355363533).

The spelling of 21313232132221 in words is "twenty-one trillion, three hundred thirteen billion, two hundred thirty-two million, one hundred thirty-two thousand, two hundred twenty-one".