331221121013 has 4 divisors (see below), whose sum is σ = 332143742880. Its totient is φ = 330298499148.

The previous prime is 331221120983. The next prime is 331221121031. The reversal of 331221121013 is 310121122133.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 310121122133 = 17 ⋅18242418949.

It is a cyclic number.

It is not a de Polignac number, because 331221121013 - 2⁶ = 331221120949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331221121093) 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, 461310395 + ... + 461311112.

It is an arithmetic number, because the mean of its divisors is an integer number (83035935720).

Almost surely, 2^331221121013 is an apocalyptic number.

It is an amenable number.

331221121013 is a deficient number, since it is larger than the sum of its proper divisors (922621867).

331221121013 is an equidigital number, since it uses as much as digits as its factorization.

331221121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922621866.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 331221121013 its reverse (310121122133), we get a palindrome (641342243146).

The spelling of 331221121013 in words is "three hundred thirty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, thirteen".