21113131221311 has 4 divisors (see below), whose sum is σ = 21117054871224. Its totient is φ = 21109207571400.

The previous prime is 21113131221277. The next prime is 21113131221313. The reversal of 21113131221311 is 11312213131112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21113131221311 - 2¹⁴ = 21113131204927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113131221313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1961816885 + ... + 1961827646.

It is an arithmetic number, because the mean of its divisors is an integer number (5279263717806).

Almost surely, 2^{21113131221311} is an apocalyptic number.

21113131221311 is a deficient number, since it is larger than the sum of its proper divisors (3923649913).

21113131221311 is an equidigital number, since it uses as much as digits as its factorization.

21113131221311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3923649912.

The product of its digits is 216, while the sum is 23.

Adding to 21113131221311 its reverse (11312213131112), we get a palindrome (32425344352423).

The spelling of 21113131221311 in words is "twenty-one trillion, one hundred thirteen billion, one hundred thirty-one million, two hundred twenty-one thousand, three hundred eleven".