21263102011 has 2 divisors, whose sum is σ = 21263102012. Its totient is φ = 21263102010.

The previous prime is 21263101991. The next prime is 21263102017. The reversal of 21263102011 is 11020136212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21263102011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21263102011.

It is not a weakly prime, because it can be changed into another prime (21263102017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10631551005 + 10631551006.

It is an arithmetic number, because the mean of its divisors is an integer number (10631551006).

Almost surely, 2^21263102011 is an apocalyptic number.

21263102011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21263102011 is an equidigital number, since it uses as much as digits as its factorization.

21263102011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21263102011 its reverse (11020136212), we get a palindrome (32283238223).

The spelling of 21263102011 in words is "twenty-one billion, two hundred sixty-three million, one hundred two thousand, eleven".