210434131021 has 4 divisors (see below), whose sum is σ = 215566670844. Its totient is φ = 205301591200.

The previous prime is 210434131009. The next prime is 210434131051. The reversal of 210434131021 is 120131434012.

210434131021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4988596900 + 205445534121 = 70630^2 + 453261^2 .

It is a cyclic number.

It is not a de Polignac number, because 210434131021 - 2¹⁷ = 210433999949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210434130983 and 210434131001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210434131051) 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 in 3 ways as a sum of consecutive naturals, for example, 2566269850 + ... + 2566269931.

It is an arithmetic number, because the mean of its divisors is an integer number (53891667711).

Almost surely, 2^210434131021 is an apocalyptic number.

It is an amenable number.

210434131021 is a deficient number, since it is larger than the sum of its proper divisors (5132539823).

210434131021 is an equidigital number, since it uses as much as digits as its factorization.

210434131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132539822.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 210434131021 its reverse (120131434012), we get a palindrome (330565565033).

The spelling of 210434131021 in words is "two hundred ten billion, four hundred thirty-four million, one hundred thirty-one thousand, twenty-one".