331121330223121 has 4 divisors (see below), whose sum is σ = 332103886099492. Its totient is φ = 330138774346752.

The previous prime is 331121330223053. The next prime is 331121330223161. The reversal of 331121330223121 is 121322033121133.

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 201829330422225 + 129291999800896 = 14206665^2 + 11370664^2 .

It is a cyclic number.

It is not a de Polignac number, because 331121330223121 - 2²⁷ = 331121196005393 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 331121330223121.

It is not an unprimeable number, because it can be changed into a prime (331121330223161) 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, 491277937680 + ... + 491277938353.

It is an arithmetic number, because the mean of its divisors is an integer number (83025971524873).

Almost surely, 2^{331121330223121} is an apocalyptic number.

It is an amenable number.

331121330223121 is a deficient number, since it is larger than the sum of its proper divisors (982555876371).

331121330223121 is an equidigital number, since it uses as much as digits as its factorization.

331121330223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982555876370.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 331121330223121 its reverse (121322033121133), we get a palindrome (452443363344254).

The spelling of 331121330223121 in words is "three hundred thirty-one trillion, one hundred twenty-one billion, three hundred thirty million, two hundred twenty-three thousand, one hundred twenty-one".