212120002121 has 4 divisors (see below), whose sum is σ = 212158993044. Its totient is φ = 212081011200.

The previous prime is 212120002109. The next prime is 212120002177. The reversal of 212120002121 is 121200021212.

212120002121 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 97304068096 + 114815934025 = 311936^2 + 338845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212120002121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212120002096 and 212120002105.

It is not an unprimeable number, because it can be changed into a prime (212120002421) 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, 19487300 + ... + 19498181.

It is an arithmetic number, because the mean of its divisors is an integer number (53039748261).

Almost surely, 2^212120002121 is an apocalyptic number.

It is an amenable number.

212120002121 is a deficient number, since it is larger than the sum of its proper divisors (38990923).

212120002121 is an equidigital number, since it uses as much as digits as its factorization.

212120002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38990922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212120002121 its reverse (121200021212), we get a palindrome (333320023333).

It can be divided in two parts, 2 and 12120002121, that multiplied together give a palindrome (24240004242).

The spelling of 212120002121 in words is "two hundred twelve billion, one hundred twenty million, two thousand, one hundred twenty-one".