2143230121 has 4 divisors (see below), whose sum is σ = 2148740100. Its totient is φ = 2137720144.

The previous prime is 2143230119. The next prime is 2143230151. The reversal of 2143230121 is 1210323412.

It is a happy number.

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 971194896 + 1172035225 = 31164^2 + 34235^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143230121 - 2¹ = 2143230119 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 (2143230101) 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, 2754406 + ... + 2755183.

It is an arithmetic number, because the mean of its divisors is an integer number (537185025).

Almost surely, 2^2143230121 is an apocalyptic number.

It is an amenable number.

2143230121 is a deficient number, since it is larger than the sum of its proper divisors (5509979).

2143230121 is an equidigital number, since it uses as much as digits as its factorization.

2143230121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5509978.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2143230121 is about 46295.0334377242. The cubic root of 2143230121 is about 1289.3067847715.

Adding to 2143230121 its reverse (1210323412), we get a palindrome (3353553533).

The spelling of 2143230121 in words is "two billion, one hundred forty-three million, two hundred thirty thousand, one hundred twenty-one".