1213020203 has 4 divisors (see below), whose sum is σ = 1213245048. Its totient is φ = 1212795360.

The previous prime is 1213020191. The next prime is 1213020217. The reversal of 1213020203 is 3020203121.

It is a happy number.

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 1213020203 - 2⁴ = 1213020187 is a prime.

It is a super-2 number, since 2×1213020203² = 2942836025772322418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213020283) 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 3 ways as a sum of consecutive naturals, for example, 104126 + ... + 115187.

It is an arithmetic number, because the mean of its divisors is an integer number (303311262).

Almost surely, 2^1213020203 is an apocalyptic number.

1213020203 is a deficient number, since it is larger than the sum of its proper divisors (224845).

1213020203 is an equidigital number, since it uses as much as digits as its factorization.

1213020203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224844.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1213020203 is about 34828.4395717063. The cubic root of 1213020203 is about 1066.4880938152.

Adding to 1213020203 its reverse (3020203121), we get a palindrome (4233223324).

It can be divided in two parts, 121 and 3020203, that multiplied together give a palindrome (365444563).

The spelling of 1213020203 in words is "one billion, two hundred thirteen million, twenty thousand, two hundred three".