1321213203 has 48 divisors (see below), whose sum is σ = 2075842080. Its totient is φ = 807086592.

The previous prime is 1321213199. The next prime is 1321213217. The reversal of 1321213203 is 3023121231.

1321213203 is a `hidden beast` number, since 1 + 321 + 21 + 320 + 3 = 666.

It is not a de Polignac number, because 1321213203 - 2² = 1321213199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321213253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 660601 + ... + 662597.

It is an arithmetic number, because the mean of its divisors is an integer number (43246710).

Almost surely, 2^1321213203 is an apocalyptic number.

1321213203 is a deficient number, since it is larger than the sum of its proper divisors (754628877).

1321213203 is a wasteful number, since it uses less digits than its factorization.

1321213203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148 (or 2145 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1321213203 is about 36348.4965713852. The cubic root of 1321213203 is about 1097.2972774663.

Adding to 1321213203 its reverse (3023121231), we get a palindrome (4344334434).

The spelling of 1321213203 in words is "one billion, three hundred twenty-one million, two hundred thirteen thousand, two hundred three".