2343212121 has 4 divisors (see below), whose sum is σ = 3124282832. Its totient is φ = 1562141412.

The previous prime is 2343212117. The next prime is 2343212143. The reversal of 2343212121 is 1212123432.

2343212121 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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 not a de Polignac number, because 2343212121 - 2² = 2343212117 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 (2343212161) 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, 390535351 + ... + 390535356.

It is an arithmetic number, because the mean of its divisors is an integer number (781070708).

Almost surely, 2^2343212121 is an apocalyptic number.

It is an amenable number.

2343212121 is a deficient number, since it is larger than the sum of its proper divisors (781070711).

2343212121 is an equidigital number, since it uses as much as digits as its factorization.

2343212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781070710.

The product of its digits is 576, while the sum is 21.

The square root of 2343212121 is about 48406.7363184092. The cubic root of 2343212121 is about 1328.2215891744.

Adding to 2343212121 its reverse (1212123432), we get a palindrome (3555335553).

It can be divided in two parts, 23432 and 12121, that added together give a palindrome (35553).

The spelling of 2343212121 in words is "two billion, three hundred forty-three million, two hundred twelve thousand, one hundred twenty-one".