21231222311 has 8 divisors (see below), whose sum is σ = 22920302160. Its totient is φ = 19550129472.

The previous prime is 21231222301. The next prime is 21231222317. The reversal of 21231222311 is 11322213212.

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 21231222311 - 2¹⁰ = 21231221287 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 (21231222317) 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, 1991225 + ... + 2001858.

It is an arithmetic number, because the mean of its divisors is an integer number (2865037770).

Almost surely, 2^21231222311 is an apocalyptic number.

21231222311 is a deficient number, since it is larger than the sum of its proper divisors (1689079849).

21231222311 is a wasteful number, since it uses less digits than its factorization.

21231222311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993505.

The product of its digits is 288, while the sum is 20.

Adding to 21231222311 its reverse (11322213212), we get a palindrome (32553435523).

Subtracting from 21231222311 its reverse (11322213212), we obtain a palindrome (9909009099).

The spelling of 21231222311 in words is "twenty-one billion, two hundred thirty-one million, two hundred twenty-two thousand, three hundred eleven".