21102231011 has 2 divisors, whose sum is σ = 21102231012. Its totient is φ = 21102231010.

The previous prime is 21102230983. The next prime is 21102231013. The reversal of 21102231011 is 11013220112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102231011 is a prime.

It is a super-3 number, since 3×21102231011³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

Together with 21102231013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21102231013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551115505 + 10551115506.

It is an arithmetic number, because the mean of its divisors is an integer number (10551115506).

Almost surely, 2^21102231011 is an apocalyptic number.

21102231011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102231011 is an equidigital number, since it uses as much as digits as its factorization.

21102231011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21102231011 its reverse (11013220112), we get a palindrome (32115451123).

The spelling of 21102231011 in words is "twenty-one billion, one hundred two million, two hundred thirty-one thousand, eleven".