1213123203001 has 6 divisors (see below), whose sum is σ = 1268160929210. Its totient is φ = 1160378715408.

The previous prime is 1213123202983. The next prime is 1213123203007. The reversal of 1213123203001 is 1003023213121.

It can be written as a sum of positive squares in only one way, i.e., 1176680393001 + 36442810000 = 1084749^2 + 190900^2 .

It is not a de Polignac number, because 1213123203001 - 2¹¹ = 1213123200953 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 1213123203001.

It is not an unprimeable number, because it can be changed into a prime (1213123203007) 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 5 ways as a sum of consecutive naturals, for example, 1146618756 + ... + 1146619813.

Almost surely, 2^{1213123203001} is an apocalyptic number.

It is an amenable number.

1213123203001 is a deficient number, since it is larger than the sum of its proper divisors (55037726209).

1213123203001 is an equidigital number, since it uses as much as digits as its factorization.

1213123203001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293238615 (or 2293238592 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1213123203001 its reverse (1003023213121), we get a palindrome (2216146416122).

The spelling of 1213123203001 in words is "one trillion, two hundred thirteen billion, one hundred twenty-three million, two hundred three thousand, one".