2121204195 has 72 divisors (see below), whose sum is σ = 4064076432. Its totient is φ = 1015027200.

The previous prime is 2121204161. The next prime is 2121204199. The reversal of 2121204195 is 5914021212.

It is not a de Polignac number, because 2121204195 - 2⁷ = 2121204067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121204199) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3920625 + ... + 3921165.

It is an arithmetic number, because the mean of its divisors is an integer number (56445506).

Almost surely, 2^2121204195 is an apocalyptic number.

2121204195 is a deficient number, since it is larger than the sum of its proper divisors (1942872237).

2121204195 is a wasteful number, since it uses less digits than its factorization.

2121204195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 2121204195 is about 46056.5325985359. The cubic root of 2121204195 is about 1284.8748423374.

The spelling of 2121204195 in words is "two billion, one hundred twenty-one million, two hundred four thousand, one hundred ninety-five".