212130110021 has 4 divisors (see below), whose sum is σ = 212131256844. Its totient is φ = 212128963200.

The previous prime is 212130109979. The next prime is 212130110057. The reversal of 212130110021 is 120011031212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 73067496100 + 139062613921 = 270310^2 + 372911^2 .

It is a cyclic number.

It is not a de Polignac number, because 212130110021 - 2¹⁰ = 212130108997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212130109978 and 212130110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212130110921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225650 + ... + 689331.

It is an arithmetic number, because the mean of its divisors is an integer number (53032814211).

Almost surely, 2^212130110021 is an apocalyptic number.

It is an amenable number.

212130110021 is a deficient number, since it is larger than the sum of its proper divisors (1146823).

212130110021 is an equidigital number, since it uses as much as digits as its factorization.

212130110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146822.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 212130110021 its reverse (120011031212), we get a palindrome (332141141233).

The spelling of 212130110021 in words is "two hundred twelve billion, one hundred thirty million, one hundred ten thousand, twenty-one".