21221320231311 has 32 divisors (see below), whose sum is σ = 29976484665600. Its totient is φ = 13307796632064.

The previous prime is 21221320231259. The next prime is 21221320231339. The reversal of 21221320231311 is 11313202312212.

It is not a de Polignac number, because 21221320231311 - 2¹³ = 21221320223119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221320231361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 735738456 + ... + 735767298.

It is an arithmetic number, because the mean of its divisors is an integer number (936765145800).

Almost surely, 2^{21221320231311} is an apocalyptic number.

21221320231311 is a deficient number, since it is larger than the sum of its proper divisors (8755164434289).

21221320231311 is a wasteful number, since it uses less digits than its factorization.

21221320231311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36535.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21221320231311 its reverse (11313202312212), we get a palindrome (32534522543523).

The spelling of 21221320231311 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred twenty million, two hundred thirty-one thousand, three hundred eleven".