2123412121 has 4 divisors (see below), whose sum is σ = 2123769892. Its totient is φ = 2123054352.

The previous prime is 2123412119. The next prime is 2123412133. The reversal of 2123412121 is 1212143212.

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 215032896 + 1908379225 = 14664^2 + 43685^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123412121 - 2¹ = 2123412119 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123412521) 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, 169830 + ... + 181903.

It is an arithmetic number, because the mean of its divisors is an integer number (530942473).

Almost surely, 2^2123412121 is an apocalyptic number.

It is an amenable number.

2123412121 is a deficient number, since it is larger than the sum of its proper divisors (357771).

2123412121 is an equidigital number, since it uses as much as digits as its factorization.

2123412121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357770.

The product of its digits is 192, while the sum is 19.

The square root of 2123412121 is about 46080.4961019302. The cubic root of 2123412121 is about 1285.3204893351.

Adding to 2123412121 its reverse (1212143212), we get a palindrome (3335555333).

The spelling of 2123412121 in words is "two billion, one hundred twenty-three million, four hundred twelve thousand, one hundred twenty-one".