21102231013 has 2 divisors, whose sum is σ = 21102231014. Its totient is φ = 21102231012.

The previous prime is 21102231011. The next prime is 21102231043. The reversal of 21102231013 is 31013220112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19416471649 + 1685759364 = 139343^2 + 41058^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102231013 - 2¹ = 21102231011 is a prime.

It is a super-3 number, since 3×21102231013³ (a number of 32 digits) contains 333 as substring.

Together with 21102231011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102231011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551115506 + 10551115507.

It is an arithmetic number, because the mean of its divisors is an integer number (10551115507).

Almost surely, 2^21102231013 is an apocalyptic number.

It is an amenable number.

21102231013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102231013 is an equidigital number, since it uses as much as digits as its factorization.

21102231013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21102231013 its reverse (31013220112), we get a palindrome (52115451125).

The spelling of 21102231013 in words is "twenty-one billion, one hundred two million, two hundred thirty-one thousand, thirteen".