21121102212211 has 2 divisors, whose sum is σ = 21121102212212. Its totient is φ = 21121102212210.

The previous prime is 21121102212209. The next prime is 21121102212227. The reversal of 21121102212211 is 11221220112112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21121102212211 - 2¹ = 21121102212209 is a prime.

It is a super-2 number, since 2×21121102212211² (a number of 27 digits) contains 22 as substring.

Together with 21121102212209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21121102216211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560551106105 + 10560551106106.

It is an arithmetic number, because the mean of its divisors is an integer number (10560551106106).

Almost surely, 2^{21121102212211} is an apocalyptic number.

21121102212211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121102212211 is an equidigital number, since it uses as much as digits as its factorization.

21121102212211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21121102212211 its reverse (11221220112112), we get a palindrome (32342322324323).

The spelling of 21121102212211 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million, two hundred twelve thousand, two hundred eleven".