2145032121 has 16 divisors (see below), whose sum is σ = 2929151808. Its totient is φ = 1395825600.

The previous prime is 2145032111. The next prime is 2145032179. The reversal of 2145032121 is 1212305412.

It is not a de Polignac number, because 2145032121 - 2¹⁷ = 2144901049 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (2145032111) 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, 20766 + ... + 68711.

It is an arithmetic number, because the mean of its divisors is an integer number (183071988).

Almost surely, 2^2145032121 is an apocalyptic number.

It is an amenable number.

2145032121 is a deficient number, since it is larger than the sum of its proper divisors (784119687).

2145032121 is a wasteful number, since it uses less digits than its factorization.

2145032121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89672.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2145032121 is about 46314.4914794495. The cubic root of 2145032121 is about 1289.6680276708.

Adding to 2145032121 its reverse (1212305412), we get a palindrome (3357337533).

The spelling of 2145032121 in words is "two billion, one hundred forty-five million, thirty-two thousand, one hundred twenty-one".