1221130203 has 24 divisors (see below), whose sum is σ = 1696706928. Its totient is φ = 781042176.

The previous prime is 1221130201. The next prime is 1221130291. The reversal of 1221130203 is 3020311221.

It is not a de Polignac number, because 1221130203 - 2¹ = 1221130201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221130201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 297775 + ... + 301847.

It is an arithmetic number, because the mean of its divisors is an integer number (70696122).

Almost surely, 2^1221130203 is an apocalyptic number.

1221130203 is a deficient number, since it is larger than the sum of its proper divisors (475576725).

1221130203 is an equidigital number, since it uses as much as digits as its factorization.

1221130203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223 (or 4186 counting only the distinct ones).

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

The square root of 1221130203 is about 34944.6734567659. The cubic root of 1221130203 is about 1068.8595888309.

Adding to 1221130203 its reverse (3020311221), we get a palindrome (4241441424).

The spelling of 1221130203 in words is "one billion, two hundred twenty-one million, one hundred thirty thousand, two hundred three".