21120211221029 has 2 divisors, whose sum is σ = 21120211221030. Its totient is φ = 21120211221028.

The previous prime is 21120211221017. The next prime is 21120211221101. The reversal of 21120211221029 is 92012211202112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17848808296225 + 3271402924804 = 4224785^2 + 1808702^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120211221029 - 2¹⁶ = 21120211155493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120211220989 and 21120211221007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120211220029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560105610514 + 10560105610515.

It is an arithmetic number, because the mean of its divisors is an integer number (10560105610515).

Almost surely, 2^{21120211221029} is an apocalyptic number.

It is an amenable number.

21120211221029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120211221029 is an equidigital number, since it uses as much as digits as its factorization.

21120211221029 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 21120211221029 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty-one thousand, twenty-nine".