21222012021121 has 2 divisors, whose sum is σ = 21222012021122. Its totient is φ = 21222012021120.

The previous prime is 21222012021029. The next prime is 21222012021139. The reversal of 21222012021121 is 12112021022212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20958267120400 + 263744900721 = 4578020^2 + 513561^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222012021121 - 2²¹ = 21222009923969 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222012021191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611006010560 + 10611006010561.

It is an arithmetic number, because the mean of its divisors is an integer number (10611006010561).

Almost surely, 2^{21222012021121} is an apocalyptic number.

It is an amenable number.

21222012021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222012021121 is an equidigital number, since it uses as much as digits as its factorization.

21222012021121 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 19.

Adding to 21222012021121 its reverse (12112021022212), we get a palindrome (33334033043333).

The spelling of 21222012021121 in words is "twenty-one trillion, two hundred twenty-two billion, twelve million, twenty-one thousand, one hundred twenty-one".