21222120122129 has 2 divisors, whose sum is σ = 21222120122130. Its totient is φ = 21222120122128.

The previous prime is 21222120122083. The next prime is 21222120122209. The reversal of 21222120122129 is 92122102122212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18999590757904 + 2222529364225 = 4358852^2 + 1490815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222120122129 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222120722129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611060061064 + 10611060061065.

It is an arithmetic number, because the mean of its divisors is an integer number (10611060061065).

Almost surely, 2^{21222120122129} is an apocalyptic number.

It is an amenable number.

21222120122129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222120122129 is an equidigital number, since it uses as much as digits as its factorization.

21222120122129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 21222120122129 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred twenty-two thousand, one hundred twenty-nine".