21222120111029 has 2 divisors, whose sum is σ = 21222120111030. Its totient is φ = 21222120111028.

The previous prime is 21222120111011. The next prime is 21222120111067. The reversal of 21222120111029 is 92011102122212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17138192428900 + 4083927682129 = 4139830^2 + 2020873^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222120111029 - 2¹² = 21222120106933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222120110989 and 21222120111007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222120111529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611060055514 + 10611060055515.

It is an arithmetic number, because the mean of its divisors is an integer number (10611060055515).

Almost surely, 2^{21222120111029} is an apocalyptic number.

It is an amenable number.

21222120111029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222120111029 is an equidigital number, since it uses as much as digits as its factorization.

21222120111029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 21222120111029 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred eleven thousand, twenty-nine".