21031122142111 has 2 divisors, whose sum is σ = 21031122142112. Its totient is φ = 21031122142110.

The previous prime is 21031122142099. The next prime is 21031122142159. The reversal of 21031122142111 is 11124122113012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21031122142111 - 2¹⁹ = 21031121617823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21031122142211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515561071055 + 10515561071056.

It is an arithmetic number, because the mean of its divisors is an integer number (10515561071056).

Almost surely, 2^{21031122142111} is an apocalyptic number.

21031122142111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031122142111 is an equidigital number, since it uses as much as digits as its factorization.

21031122142111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 21031122142111 its reverse (11124122113012), we get a palindrome (32155244255123).

The spelling of 21031122142111 in words is "twenty-one trillion, thirty-one billion, one hundred twenty-two million, one hundred forty-two thousand, one hundred eleven".