21313220311205 has 8 divisors (see below), whose sum is σ = 25718746298400. Its totient is φ = 16955321632336.

The previous prime is 21313220311199. The next prime is 21313220311231. The reversal of 21313220311205 is 50211302231312.

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 21313220311205 - 2²⁸ = 21312951875749 is a prime.

It is a super-2 number, since 2×21313220311205² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11906826095 + ... + 11906827884.

It is an arithmetic number, because the mean of its divisors is an integer number (3214843287300).

Almost surely, 2^{21313220311205} is an apocalyptic number.

It is an amenable number.

21313220311205 is a deficient number, since it is larger than the sum of its proper divisors (4405525987195).

21313220311205 is a wasteful number, since it uses less digits than its factorization.

21313220311205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23813654163.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21313220311205 its reverse (50211302231312), we get a palindrome (71524522542517).

The spelling of 21313220311205 in words is "twenty-one trillion, three hundred thirteen billion, two hundred twenty million, three hundred eleven thousand, two hundred five".