21201212012011 has 2 divisors, whose sum is σ = 21201212012012. Its totient is φ = 21201212012010.

The previous prime is 21201212011979. The next prime is 21201212012051. The reversal of 21201212012011 is 11021021210212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201212012011 - 2⁵ = 21201212011979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201212012051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600606006005 + 10600606006006.

It is an arithmetic number, because the mean of its divisors is an integer number (10600606006006).

Almost surely, 2^{21201212012011} is an apocalyptic number.

21201212012011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201212012011 is an equidigital number, since it uses as much as digits as its factorization.

21201212012011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21201212012011 its reverse (11021021210212), we get a palindrome (32222233222223).

The spelling of 21201212012011 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, twelve thousand, eleven".