21121210110211 has 2 divisors, whose sum is σ = 21121210110212. Its totient is φ = 21121210110210.

The previous prime is 21121210110157. The next prime is 21121210110229. The reversal of 21121210110211 is 11201101212112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121210110211 - 2¹⁹ = 21121209585923 is a prime.

It is a super-2 number, since 2×21121210110211² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21121210110251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560605055105 + 10560605055106.

It is an arithmetic number, because the mean of its divisors is an integer number (10560605055106).

Almost surely, 2^{21121210110211} is an apocalyptic number.

21121210110211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121210110211 is an equidigital number, since it uses as much as digits as its factorization.

21121210110211 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 21121210110211 its reverse (11201101212112), we get a palindrome (32322311322323).

The spelling of 21121210110211 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, one hundred ten thousand, two hundred eleven".