1213120203 has 4 divisors (see below), whose sum is σ = 1617493608. Its totient is φ = 808746800.

The previous prime is 1213120193. The next prime is 1213120247. The reversal of 1213120203 is 3020213121.

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 1213120203 - 2¹³ = 1213112011 is a prime.

It is a super-2 number, since 2×1213120203² = 2943321253853522418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213120253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202186698 + ... + 202186703.

It is an arithmetic number, because the mean of its divisors is an integer number (404373402).

Almost surely, 2^1213120203 is an apocalyptic number.

1213120203 is a deficient number, since it is larger than the sum of its proper divisors (404373405).

1213120203 is an equidigital number, since it uses as much as digits as its factorization.

1213120203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404373404.

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

The square root of 1213120203 is about 34829.8751505084. The cubic root of 1213120203 is about 1066.5173996967.

Adding to 1213120203 its reverse (3020213121), we get a palindrome (4233333324).

The spelling of 1213120203 in words is "one billion, two hundred thirteen million, one hundred twenty thousand, two hundred three".