2143121245 has 16 divisors (see below), whose sum is σ = 2714811840. Its totient is φ = 1619633664.

The previous prime is 2143121237. The next prime is 2143121249. The reversal of 2143121245 is 5421213412.

It is a cyclic number.

It is not a de Polignac number, because 2143121245 - 2³ = 2143121237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143121249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1582 + ... + 65488.

It is an arithmetic number, because the mean of its divisors is an integer number (169675740).

Almost surely, 2^2143121245 is an apocalyptic number.

It is an amenable number.

2143121245 is a deficient number, since it is larger than the sum of its proper divisors (571690595).

2143121245 is a wasteful number, since it uses less digits than its factorization.

2143121245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64284.

The product of its digits is 1920, while the sum is 25.

The square root of 2143121245 is about 46293.8575299143. The cubic root of 2143121245 is about 1289.2849521583.

Adding to 2143121245 its reverse (5421213412), we get a palindrome (7564334657).

The spelling of 2143121245 in words is "two billion, one hundred forty-three million, one hundred twenty-one thousand, two hundred forty-five".