1201321320213 has 12 divisors (see below), whose sum is σ = 1863273884640. Its totient is φ = 686469325752.

The previous prime is 1201321320211. The next prime is 1201321320223. The reversal of 1201321320213 is 3120231231021.

It is not a de Polignac number, because 1201321320213 - 2¹ = 1201321320211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 1201321320213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201321320211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4086126793 + ... + 4086127086.

It is an arithmetic number, because the mean of its divisors is an integer number (155272823720).

Almost surely, 2^{1201321320213} is an apocalyptic number.

It is an amenable number.

1201321320213 is a deficient number, since it is larger than the sum of its proper divisors (661952564427).

1201321320213 is an equidigital number, since it uses as much as digits as its factorization.

1201321320213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8172253896 (or 8172253889 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1201321320213 its reverse (3120231231021), we get a palindrome (4321552551234).

The spelling of 1201321320213 in words is "one trillion, two hundred one billion, three hundred twenty-one million, three hundred twenty thousand, two hundred thirteen".