21312244221311 has 8 divisors (see below), whose sum is σ = 22902710209200. Its totient is φ = 19759200962688.

The previous prime is 21312244221283. The next prime is 21312244221353. The reversal of 21312244221311 is 11312244221312.

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-21312244221311 is a prime.

It is a super-2 number, since 2×21312244221311² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312244221361) 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, 9355681136 + ... + 9355683413.

It is an arithmetic number, because the mean of its divisors is an integer number (2862838776150).

Almost surely, 2^{21312244221311} is an apocalyptic number.

21312244221311 is a deficient number, since it is larger than the sum of its proper divisors (1590465987889).

21312244221311 is a wasteful number, since it uses less digits than its factorization.

21312244221311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18711364633.

The product of its digits is 4608, while the sum is 29.

Adding to 21312244221311 its reverse (11312244221312), we get a palindrome (32624488442623).

Subtracting from 21312244221311 its reverse (11312244221312), we obtain a palindrome (9999999999999).

The spelling of 21312244221311 in words is "twenty-one trillion, three hundred twelve billion, two hundred forty-four million, two hundred twenty-one thousand, three hundred eleven".