331121021 has 8 divisors (see below), whose sum is σ = 412826304. Its totient is φ = 258016320.

The previous prime is 331121009. The next prime is 331121033. The reversal of 331121021 is 120121133.

It is an interprime number because it is at equal distance from previous prime (331121009) and next prime (331121033).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 331121021 - 2²⁶ = 264012157 is a prime.

It is a super-2 number, since 2×331121021² = 219282261096164882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331120987 and 331121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331121081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2150060 + ... + 2150213.

It is an arithmetic number, because the mean of its divisors is an integer number (51603288).

Almost surely, 2^331121021 is an apocalyptic number.

It is an amenable number.

331121021 is a deficient number, since it is larger than the sum of its proper divisors (81705283).

331121021 is a wasteful number, since it uses less digits than its factorization.

331121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300291.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 331121021 is about 18196.7310525819. The cubic root of 331121021 is about 691.8239365477.

Adding to 331121021 its reverse (120121133), we get a palindrome (451242154).

The spelling of 331121021 in words is "three hundred thirty-one million, one hundred twenty-one thousand, twenty-one".