1231021203 has 32 divisors (see below), whose sum is σ = 1779148800. Its totient is φ = 754782336.

The previous prime is 1231021201. The next prime is 1231021237. The reversal of 1231021203 is 3021201321.

It is not a de Polignac number, because 1231021203 - 2¹ = 1231021201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 537126 + ... + 539412.

It is an arithmetic number, because the mean of its divisors is an integer number (55598400).

Almost surely, 2^1231021203 is an apocalyptic number.

1231021203 is a deficient number, since it is larger than the sum of its proper divisors (548127597).

1231021203 is a wasteful number, since it uses less digits than its factorization.

1231021203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2611.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1231021203 is about 35085.9117453145. The cubic root of 1231021203 is about 1071.7377077318.

Adding to 1231021203 its reverse (3021201321), we get a palindrome (4252222524).

The spelling of 1231021203 in words is "one billion, two hundred thirty-one million, twenty-one thousand, two hundred three".