331221240 has 96 divisors (see below), whose sum is σ = 1230259680. Its totient is φ = 75707136.

The previous prime is 331221239. The next prime is 331221269. The reversal of 331221240 is 42122133.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63199 + ... + 68238.

It is an arithmetic number, because the mean of its divisors is an integer number (12815205).

Almost surely, 2^331221240 is an apocalyptic number.

331221240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

331221240 is an abundant number, since it is smaller than the sum of its proper divisors (899038440).

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

331221240 is a wasteful number, since it uses less digits than its factorization.

331221240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131461 (or 131454 counting only the distinct ones).

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

The square root of 331221240 is about 18199.4846080871. The cubic root of 331221240 is about 691.8937266495.

Adding to 331221240 its reverse (42122133), we get a palindrome (373343373).

The spelling of 331221240 in words is "three hundred thirty-one million, two hundred twenty-one thousand, two hundred forty".