21231132311 has 4 divisors (see below), whose sum is σ = 21306688224. Its totient is φ = 21155576400.

The previous prime is 21231132283. The next prime is 21231132313. The reversal of 21231132311 is 11323113212.

It is a happy number.

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 21231132311 - 2¹⁰ = 21231131287 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 (21231132313) 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, 37777535 + ... + 37778096.

It is an arithmetic number, because the mean of its divisors is an integer number (5326672056).

Almost surely, 2^21231132311 is an apocalyptic number.

21231132311 is a deficient number, since it is larger than the sum of its proper divisors (75555913).

21231132311 is an equidigital number, since it uses as much as digits as its factorization.

21231132311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75555912.

The product of its digits is 216, while the sum is 20.

Adding to 21231132311 its reverse (11323113212), we get a palindrome (32554245523).

The spelling of 21231132311 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty-two thousand, three hundred eleven".