21103434021029 has 2 divisors, whose sum is σ = 21103434021030. Its totient is φ = 21103434021028.

The previous prime is 21103434020989. The next prime is 21103434021091. The reversal of 21103434021029 is 92012043430112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18938798608129 + 2164635412900 = 4351873^2 + 1471270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103434021029 - 2¹⁶ = 21103433955493 is a prime.

It is a super-2 number, since 2×21103434021029² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21103434020986 and 21103434021004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103434026029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551717010514 + 10551717010515.

It is an arithmetic number, because the mean of its divisors is an integer number (10551717010515).

Almost surely, 2^{21103434021029} is an apocalyptic number.

It is an amenable number.

21103434021029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103434021029 is an equidigital number, since it uses as much as digits as its factorization.

21103434021029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21103434021029 in words is "twenty-one trillion, one hundred three billion, four hundred thirty-four million, twenty-one thousand, twenty-nine".