21211011022111 has 2 divisors, whose sum is σ = 21211011022112. Its totient is φ = 21211011022110.

The previous prime is 21211011022109. The next prime is 21211011022139. The reversal of 21211011022111 is 11122011011212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211011022111 - 2¹ = 21211011022109 is a prime.

It is a super-2 number, since 2×21211011022111² (a number of 27 digits) contains 22 as substring.

Together with 21211011022109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211011022141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605505511055 + 10605505511056.

It is an arithmetic number, because the mean of its divisors is an integer number (10605505511056).

Almost surely, 2^{21211011022111} is an apocalyptic number.

21211011022111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211011022111 is an equidigital number, since it uses as much as digits as its factorization.

21211011022111 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 21211011022111 its reverse (11122011011212), we get a palindrome (32333022033323).

The spelling of 21211011022111 in words is "twenty-one trillion, two hundred eleven billion, eleven million, twenty-two thousand, one hundred eleven".