1311203123210 has 16 divisors (see below), whose sum is σ = 2404697049576. Its totient is φ = 514585376448.

The previous prime is 1311203123203. The next prime is 1311203123249. The reversal of 1311203123210 is 123213021131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1308742864009 + 2460259201 = 1144003^2 + 49601^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1236983549 + ... + 1236984608.

Almost surely, 2^{1311203123210} is an apocalyptic number.

1311203123210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1311203123210 is a deficient number, since it is larger than the sum of its proper divisors (1093493926366).

1311203123210 is a wasteful number, since it uses less digits than its factorization.

1311203123210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473968217.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1311203123210 its reverse (123213021131), we get a palindrome (1434416144341).

The spelling of 1311203123210 in words is "one trillion, three hundred eleven billion, two hundred three million, one hundred twenty-three thousand, two hundred ten".