1221133203 has 12 divisors (see below), whose sum is σ = 1767457848. Its totient is φ = 812427840.

The previous prime is 1221133159. The next prime is 1221133231. The reversal of 1221133203 is 3023311221.

It is not a de Polignac number, because 1221133203 - 2⁶ = 1221133139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221133003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133750 + ... + 142587.

It is an arithmetic number, because the mean of its divisors is an integer number (147288154).

Almost surely, 2^1221133203 is an apocalyptic number.

1221133203 is a deficient number, since it is larger than the sum of its proper divisors (546324645).

1221133203 is a wasteful number, since it uses less digits than its factorization.

1221133203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276834 (or 276831 counting only the distinct ones).

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

The square root of 1221133203 is about 34944.7163817365. The cubic root of 1221133203 is about 1068.8604641337.

Adding to 1221133203 its reverse (3023311221), we get a palindrome (4244444424).

It can be divided in two parts, 122113 and 3203, that added together give a square (125316 = 354²).

The spelling of 1221133203 in words is "one billion, two hundred twenty-one million, one hundred thirty-three thousand, two hundred three".