331020121321 has 4 divisors (see below), whose sum is σ = 331047087444. Its totient is φ = 330993155200.

The previous prime is 331020121319. The next prime is 331020121357. The reversal of 331020121321 is 123121020133.

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 210846272400 + 120173848921 = 459180^2 + 346661^2 .

It is a cyclic number.

It is not a de Polignac number, because 331020121321 - 2¹ = 331020121319 is a prime.

It is a super-4 number, since 4×331020121321⁴ (a number of 47 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331020121381) 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, 13464640 + ... + 13489201.

It is an arithmetic number, because the mean of its divisors is an integer number (82761771861).

Almost surely, 2^331020121321 is an apocalyptic number.

It is an amenable number.

331020121321 is a deficient number, since it is larger than the sum of its proper divisors (26966123).

331020121321 is a wasteful number, since it uses less digits than its factorization.

331020121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26966122.

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

Adding to 331020121321 its reverse (123121020133), we get a palindrome (454141141454).

The spelling of 331020121321 in words is "three hundred thirty-one billion, twenty million, one hundred twenty-one thousand, three hundred twenty-one".