21232312311 has 8 divisors (see below), whose sum is σ = 32353999744. Its totient is φ = 12132749880.

The previous prime is 21232312243. The next prime is 21232312327. The reversal of 21232312311 is 11321323212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21232312311 - 2²² = 21228118007 is a prime.

It is a super-2 number, since 2×21232312311² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1011062491 = 21232312311 / (2 + 1 + 2 + 3 + 2 + 3 + 1 + 2 + 3 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232312711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505531225 + ... + 505531266.

It is an arithmetic number, because the mean of its divisors is an integer number (4044249968).

Almost surely, 2^21232312311 is an apocalyptic number.

21232312311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21232312311 is a deficient number, since it is larger than the sum of its proper divisors (11121687433).

21232312311 is a wasteful number, since it uses less digits than its factorization.

21232312311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011062501.

The product of its digits is 432, while the sum is 21.

Adding to 21232312311 its reverse (11321323212), we get a palindrome (32553635523).

The spelling of 21232312311 in words is "twenty-one billion, two hundred thirty-two million, three hundred twelve thousand, three hundred eleven".