1211864743123 has 8 divisors (see below), whose sum is σ = 1223885977056. Its totient is φ = 1199843952000.

The previous prime is 1211864743109. The next prime is 1211864743127. The reversal of 1211864743123 is 3213474681121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211864743123 - 2⁵ = 1211864743091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211864743123.

It is not an unprimeable number, because it can be changed into a prime (1211864743127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9531138 + ... + 9657448.

It is an arithmetic number, because the mean of its divisors is an integer number (152985747132).

Almost surely, 2^{1211864743123} is an apocalyptic number.

1211864743123 is a deficient number, since it is larger than the sum of its proper divisors (12021233933).

1211864743123 is a wasteful number, since it uses less digits than its factorization.

1211864743123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221405.

The product of its digits is 193536, while the sum is 43.

The spelling of 1211864743123 in words is "one trillion, two hundred eleven billion, eight hundred sixty-four million, seven hundred forty-three thousand, one hundred twenty-three".