331112121021 has 12 divisors (see below), whose sum is σ = 521752433280. Its totient is φ = 200674012680.

The previous prime is 331112121019. The next prime is 331112121023. The reversal of 331112121021 is 120121211133.

331112121021 is a `hidden beast` number, since 3 + 311 + 121 + 210 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (331112121019) and next prime (331112121023).

It is not a de Polignac number, because 331112121021 - 2¹ = 331112121019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331112120985 and 331112121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331112121023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1672283341 + ... + 1672283538.

It is an arithmetic number, because the mean of its divisors is an integer number (43479369440).

Almost surely, 2^331112121021 is an apocalyptic number.

It is an amenable number.

331112121021 is a deficient number, since it is larger than the sum of its proper divisors (190640312259).

331112121021 is a wasteful number, since it uses less digits than its factorization.

331112121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344566896 (or 3344566893 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 331112121021 its reverse (120121211133), we get a palindrome (451233332154).

The spelling of 331112121021 in words is "three hundred thirty-one billion, one hundred twelve million, one hundred twenty-one thousand, twenty-one".