21120211221101 has 2 divisors, whose sum is σ = 21120211221102. Its totient is φ = 21120211221100.

The previous prime is 21120211221029. The next prime is 21120211221103. The reversal of 21120211221101 is 10112211202112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16467777918601 + 4652433302500 = 4058051^2 + 2156950^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120211221101 - 2²² = 21120207026797 is a prime.

Together with 21120211221103, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21120211221101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120211221103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560105610550 + 10560105610551.

It is an arithmetic number, because the mean of its divisors is an integer number (10560105610551).

Almost surely, 2^{21120211221101} is an apocalyptic number.

It is an amenable number.

21120211221101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120211221101 is an equidigital number, since it uses as much as digits as its factorization.

21120211221101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21120211221101 its reverse (10112211202112), we get a palindrome (31232422423213).

The spelling of 21120211221101 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty-one thousand, one hundred one".