21331264311 has 12 divisors (see below), whose sum is σ = 35213515792. Its totient is φ = 12189293856.

The previous prime is 21331264247. The next prime is 21331264343. The reversal of 21331264311 is 11346213312.

It is a happy number.

21331264311 is a `hidden beast` number, since 2 + 1 + 3 + 3 + 1 + 2 + 643 + 11 = 666.

It is not a de Polignac number, because 21331264311 - 2⁶ = 21331264247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331264351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169295686 + ... + 169295811.

Almost surely, 2^21331264311 is an apocalyptic number.

21331264311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21331264311 is a deficient number, since it is larger than the sum of its proper divisors (13882251481).

21331264311 is a wasteful number, since it uses less digits than its factorization.

21331264311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338591510 (or 338591507 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 21331264311 its reverse (11346213312), we get a palindrome (32677477623).

The spelling of 21331264311 in words is "twenty-one billion, three hundred thirty-one million, two hundred sixty-four thousand, three hundred eleven".