1331121323201 has 4 divisors (see below), whose sum is σ = 1334829182400. Its totient is φ = 1327413464004.

The previous prime is 1331121323047. The next prime is 1331121323261. The reversal of 1331121323201 is 1023231211331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1331121323201 - 2¹⁸ = 1331121061057 is a prime.

It is a super-2 number, since 2×1331121323201² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1331121323261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1853929061 + ... + 1853929778.

It is an arithmetic number, because the mean of its divisors is an integer number (333707295600).

Almost surely, 2^{1331121323201} is an apocalyptic number.

It is an amenable number.

1331121323201 is a deficient number, since it is larger than the sum of its proper divisors (3707859199).

1331121323201 is an equidigital number, since it uses as much as digits as its factorization.

1331121323201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707859198.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1331121323201 its reverse (1023231211331), we get a palindrome (2354352534532).

The spelling of 1331121323201 in words is "one trillion, three hundred thirty-one billion, one hundred twenty-one million, three hundred twenty-three thousand, two hundred one".