1203121209 has 16 divisors (see below), whose sum is σ = 1645459200. Its totient is φ = 781522896.

The previous prime is 1203121201. The next prime is 1203121223. The reversal of 1203121209 is 9021213021.

1203121209 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1203121209 - 2³ = 1203121201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1203121201) 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, 42922 + ... + 65180.

It is an arithmetic number, because the mean of its divisors is an integer number (102841200).

Almost surely, 2^1203121209 is an apocalyptic number.

It is an amenable number.

1203121209 is a deficient number, since it is larger than the sum of its proper divisors (442337991).

1203121209 is a wasteful number, since it uses less digits than its factorization.

1203121209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22724.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1203121209 is about 34686.0376664732. The cubic root of 1203121209 is about 1063.5790991776.

The spelling of 1203121209 in words is "one billion, two hundred three million, one hundred twenty-one thousand, two hundred nine".