2143453121 has 4 divisors (see below), whose sum is σ = 2193300912. Its totient is φ = 2093605332.

The previous prime is 2143453087. The next prime is 2143453139. The reversal of 2143453121 is 1213543412.

It is a happy number.

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 2143453121 - 2¹⁸ = 2143190977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143453021) 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, 24923831 + ... + 24923916.

It is an arithmetic number, because the mean of its divisors is an integer number (548325228).

Almost surely, 2^2143453121 is an apocalyptic number.

It is an amenable number.

2143453121 is a deficient number, since it is larger than the sum of its proper divisors (49847791).

2143453121 is an equidigital number, since it uses as much as digits as its factorization.

2143453121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49847790.

The product of its digits is 2880, while the sum is 26.

The square root of 2143453121 is about 46297.4418407756. The cubic root of 2143453121 is about 1289.3515000572.

Adding to 2143453121 its reverse (1213543412), we get a palindrome (3356996533).

The spelling of 2143453121 in words is "two billion, one hundred forty-three million, four hundred fifty-three thousand, one hundred twenty-one".