331021242 has 20 divisors (see below), whose sum is σ = 741733146. Its totient is φ = 110340360.

The previous prime is 331021213. The next prime is 331021259. The reversal of 331021242 is 242120133.

331021242 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 310852161 + 20169081 = 17631^2 + 4491^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1021509 + ... + 1021832.

Almost surely, 2^331021242 is an apocalyptic number.

331021242 is an abundant number, since it is smaller than the sum of its proper divisors (410711904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

331021242 is a wasteful number, since it uses less digits than its factorization.

331021242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043355 (or 2043346 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 331021242 is about 18193.9891722514. The cubic root of 331021242 is about 691.7544388605.

Adding to 331021242 its reverse (242120133), we get a palindrome (573141375).

The spelling of 331021242 in words is "three hundred thirty-one million, twenty-one thousand, two hundred forty-two".