1212403763523 has 16 divisors (see below), whose sum is σ = 1657102081536. Its totient is φ = 788054806560.

The previous prime is 1212403763489. The next prime is 1212403763551. The reversal of 1212403763523 is 3253673042121.

It is a happy number.

It is not a de Polignac number, because 1212403763523 - 2¹⁰ = 1212403762499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212403763723) 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 15 ways as a sum of consecutive naturals, for example, 8364843 + ... + 8508548.

It is an arithmetic number, because the mean of its divisors is an integer number (103568880096).

Almost surely, 2^{1212403763523} is an apocalyptic number.

1212403763523 is a deficient number, since it is larger than the sum of its proper divisors (444698318013).

1212403763523 is a wasteful number, since it uses less digits than its factorization.

1212403763523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16873994.

The product of its (nonzero) digits is 181440, while the sum is 39.

The spelling of 1212403763523 in words is "one trillion, two hundred twelve billion, four hundred three million, seven hundred sixty-three thousand, five hundred twenty-three".