21121110201211 has 2 divisors, whose sum is σ = 21121110201212. Its totient is φ = 21121110201210.

The previous prime is 21121110201131. The next prime is 21121110201239. The reversal of 21121110201211 is 11210201112112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121110201211 - 2¹⁷ = 21121110070139 is a prime.

It is a super-2 number, since 2×21121110201211² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21121110201251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560555100605 + 10560555100606.

It is an arithmetic number, because the mean of its divisors is an integer number (10560555100606).

Almost surely, 2^{21121110201211} is an apocalyptic number.

21121110201211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121110201211 is an equidigital number, since it uses as much as digits as its factorization.

21121110201211 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21121110201211 its reverse (11210201112112), we get a palindrome (32331311313323).

The spelling of 21121110201211 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, two hundred one thousand, two hundred eleven".