21022122212111 has 2 divisors, whose sum is σ = 21022122212112. Its totient is φ = 21022122212110.

The previous prime is 21022122212099. The next prime is 21022122212137. The reversal of 21022122212111 is 11121222122012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21022122212111 - 2¹⁸ = 21022121949967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022122212171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511061106055 + 10511061106056.

It is an arithmetic number, because the mean of its divisors is an integer number (10511061106056).

Almost surely, 2^{21022122212111} is an apocalyptic number.

21022122212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022122212111 is an equidigital number, since it uses as much as digits as its factorization.

21022122212111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21022122212111 its reverse (11121222122012), we get a palindrome (32143344334123).

Subtracting from 21022122212111 its reverse (11121222122012), we obtain a palindrome (9900900090099).

The spelling of 21022122212111 in words is "twenty-one trillion, twenty-two billion, one hundred twenty-two million, two hundred twelve thousand, one hundred eleven".