21210122121029 has 2 divisors, whose sum is σ = 21210122121030. Its totient is φ = 21210122121028.

The previous prime is 21210122120969. The next prime is 21210122121047. The reversal of 21210122121029 is 92012122101212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17427493890625 + 3782628230404 = 4174625^2 + 1944898^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210122121029 - 2²⁴ = 21210105343813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210122120989 and 21210122121007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210121121029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605061060514 + 10605061060515.

It is an arithmetic number, because the mean of its divisors is an integer number (10605061060515).

Almost surely, 2^{21210122121029} is an apocalyptic number.

It is an amenable number.

21210122121029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210122121029 is an equidigital number, since it uses as much as digits as its factorization.

21210122121029 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 21210122121029 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-nine".