21222221211101 has 2 divisors, whose sum is σ = 21222221211102. Its totient is φ = 21222221211100.

The previous prime is 21222221211097. The next prime is 21222221211187. The reversal of 21222221211101 is 10111212222212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20250666005476 + 971555205625 = 4500074^2 + 985675^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222221211101 - 2² = 21222221211097 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222221211001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611110605550 + 10611110605551.

It is an arithmetic number, because the mean of its divisors is an integer number (10611110605551).

Almost surely, 2^{21222221211101} is an apocalyptic number.

It is an amenable number.

21222221211101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222221211101 is an equidigital number, since it uses as much as digits as its factorization.

21222221211101 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 21222221211101 its reverse (10111212222212), we get a palindrome (31333433433313).

The spelling of 21222221211101 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred eleven thousand, one hundred one".