21331242311 has 2 divisors, whose sum is σ = 21331242312. Its totient is φ = 21331242310.

The previous prime is 21331242301. The next prime is 21331242347. The reversal of 21331242311 is 11324213312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331242311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331242301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665621155 + 10665621156.

It is an arithmetic number, because the mean of its divisors is an integer number (10665621156).

Almost surely, 2^21331242311 is an apocalyptic number.

21331242311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331242311 is an equidigital number, since it uses as much as digits as its factorization.

21331242311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 21331242311 its reverse (11324213312), we get a palindrome (32655455623).

The spelling of 21331242311 in words is "twenty-one billion, three hundred thirty-one million, two hundred forty-two thousand, three hundred eleven".