1243212201423 has 40 divisors (see below), whose sum is σ = 1900810747088. Its totient is φ = 809330247936.

The previous prime is 1243212201403. The next prime is 1243212201463. The reversal of 1243212201423 is 3241022123421.

1243212201423 is a `hidden beast` number, since 1 + 2 + 4 + 3 + 212 + 20 + 1 + 423 = 666.

It is not a de Polignac number, because 1243212201423 - 2⁶ = 1243212201359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243212201403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14505765 + ... + 14591217.

Almost surely, 2^{1243212201423} is an apocalyptic number.

1243212201423 is a deficient number, since it is larger than the sum of its proper divisors (657598545665).

1243212201423 is an equidigital number, since it uses as much as digits as its factorization.

1243212201423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89685 (or 89676 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 1243212201423 its reverse (3241022123421), we get a palindrome (4484234324844).

The spelling of 1243212201423 in words is "one trillion, two hundred forty-three billion, two hundred twelve million, two hundred one thousand, four hundred twenty-three".