2130212121 has 4 divisors (see below), whose sum is σ = 2840282832. Its totient is φ = 1420141412.

The previous prime is 2130212111. The next prime is 2130212129. The reversal of 2130212121 is 1212120312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2130212121 - 2⁹ = 2130211609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2130212121.

It is not an unprimeable number, because it can be changed into a prime (2130212129) 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, 355035351 + ... + 355035356.

It is an arithmetic number, because the mean of its divisors is an integer number (710070708).

Almost surely, 2^2130212121 is an apocalyptic number.

It is an amenable number.

2130212121 is a deficient number, since it is larger than the sum of its proper divisors (710070711).

2130212121 is an equidigital number, since it uses as much as digits as its factorization.

2130212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710070710.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2130212121 is about 46154.2210529005. The cubic root of 2130212121 is about 1286.6910610947.

Adding to 2130212121 its reverse (1212120312), we get a palindrome (3342332433).

The spelling of 2130212121 in words is "two billion, one hundred thirty million, two hundred twelve thousand, one hundred twenty-one".