21212120120011 has 2 divisors, whose sum is σ = 21212120120012. Its totient is φ = 21212120120010.

The previous prime is 21212120119961. The next prime is 21212120120021. The reversal of 21212120120011 is 11002102121212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212120120011 - 2⁹ = 21212120119499 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212120120021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606060060005 + 10606060060006.

It is an arithmetic number, because the mean of its divisors is an integer number (10606060060006).

Almost surely, 2^{21212120120011} is an apocalyptic number.

21212120120011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212120120011 is an equidigital number, since it uses as much as digits as its factorization.

21212120120011 is an evil number, because the sum of its binary digits is even.

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

Adding to 21212120120011 its reverse (11002102121212), we get a palindrome (32214222241223).

It can be divided in two parts, 212121201 and 20011, that added together give a palindrome (212141212).

The spelling of 21212120120011 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty million, one hundred twenty thousand, eleven".