1213100203 has 12 divisors (see below), whose sum is σ = 1430492520. Its totient is φ = 1025553312.

The previous prime is 1213100183. The next prime is 1213100233. The reversal of 1213100203 is 3020013121.

It is not a de Polignac number, because 1213100203 - 2⁹ = 1213099691 is a prime.

It is a super-2 number, since 2×1213100203² = 2943224205037282418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213100233) 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, 165993 + ... + 173146.

It is an arithmetic number, because the mean of its divisors is an integer number (119207710).

Almost surely, 2^1213100203 is an apocalyptic number.

1213100203 is a deficient number, since it is larger than the sum of its proper divisors (217392317).

1213100203 is an equidigital number, since it uses as much as digits as its factorization.

1213100203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339226 (or 339219 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1213100203 is about 34829.5880394816. The cubic root of 1213100203 is about 1066.5115386492.

Adding to 1213100203 its reverse (3020013121), we get a palindrome (4233113324).

The spelling of 1213100203 in words is "one billion, two hundred thirteen million, one hundred thousand, two hundred three".