1212003011321 has 4 divisors (see below), whose sum is σ = 1228605792372. Its totient is φ = 1195400230272.

The previous prime is 1212003011309. The next prime is 1212003011327. The reversal of 1212003011321 is 1231103002121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 589578265600 + 622424745721 = 767840^2 + 788939^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212003011321 - 2⁶ = 1212003011257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212003011321.

It is not an unprimeable number, because it can be changed into a prime (1212003011327) 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 3 ways as a sum of consecutive naturals, for example, 8301390416 + ... + 8301390561.

It is an arithmetic number, because the mean of its divisors is an integer number (307151448093).

Almost surely, 2^{1212003011321} is an apocalyptic number.

It is an amenable number.

1212003011321 is a deficient number, since it is larger than the sum of its proper divisors (16602781051).

1212003011321 is an equidigital number, since it uses as much as digits as its factorization.

1212003011321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16602781050.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1212003011321 its reverse (1231103002121), we get a palindrome (2443106013442).

The spelling of 1212003011321 in words is "one trillion, two hundred twelve billion, three million, eleven thousand, three hundred twenty-one".