1213112203 has 4 divisors (see below), whose sum is σ = 1213555608. Its totient is φ = 1212668800.

The previous prime is 1213112183. The next prime is 1213112213. The reversal of 1213112203 is 3022113121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213112203 - 2¹⁷ = 1212981131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213112213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217573 + ... + 223078.

It is an arithmetic number, because the mean of its divisors is an integer number (303388902).

Almost surely, 2^1213112203 is an apocalyptic number.

1213112203 is a deficient number, since it is larger than the sum of its proper divisors (443405).

1213112203 is an equidigital number, since it uses as much as digits as its factorization.

1213112203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443404.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1213112203 is about 34829.7603063817. The cubic root of 1213112203 is about 1066.5150552854.

Adding to 1213112203 its reverse (3022113121), we get a palindrome (4235225324).

The spelling of 1213112203 in words is "one billion, two hundred thirteen million, one hundred twelve thousand, two hundred three".