21211201010011 has 2 divisors, whose sum is σ = 21211201010012. Its totient is φ = 21211201010010.

The previous prime is 21211201010009. The next prime is 21211201010023. The reversal of 21211201010011 is 11001010211212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211201010011 - 2¹ = 21211201010009 is a prime.

Together with 21211201010009, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21211201009973 and 21211201010000.

It is not a weakly prime, because it can be changed into another prime (21211201010081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605600505005 + 10605600505006.

It is an arithmetic number, because the mean of its divisors is an integer number (10605600505006).

Almost surely, 2^{21211201010011} is an apocalyptic number.

21211201010011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211201010011 is an equidigital number, since it uses as much as digits as its factorization.

21211201010011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21211201010011 its reverse (11001010211212), we get a palindrome (32212211221223).

The spelling of 21211201010011 in words is "twenty-one trillion, two hundred eleven billion, two hundred one million, ten thousand, eleven".