21121211050211 has 2 divisors, whose sum is σ = 21121211050212. Its totient is φ = 21121211050210.

The previous prime is 21121211050193. The next prime is 21121211050213. The reversal of 21121211050211 is 11205011212112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121211050211 - 2²⁶ = 21121143941347 is a prime.

It is a super-2 number, since 2×21121211050211² (a number of 27 digits) contains 22 as substring.

Together with 21121211050213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21121211050213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560605525105 + 10560605525106.

It is an arithmetic number, because the mean of its divisors is an integer number (10560605525106).

Almost surely, 2^{21121211050211} is an apocalyptic number.

21121211050211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121211050211 is an equidigital number, since it uses as much as digits as its factorization.

21121211050211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 20.

Adding to 21121211050211 its reverse (11205011212112), we get a palindrome (32326222262323).

The spelling of 21121211050211 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, fifty thousand, two hundred eleven".