331240421 has 4 divisors (see below), whose sum is σ = 331433292. Its totient is φ = 331047552.

The previous prime is 331240417. The next prime is 331240451. The reversal of 331240421 is 124042133.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121859521 + 209380900 = 11039^2 + 14470^2 .

It is a cyclic number.

It is not a de Polignac number, because 331240421 - 2² = 331240417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331240393 and 331240402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331240451) 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, 93836 + ... + 97301.

It is an arithmetic number, because the mean of its divisors is an integer number (82858323).

Almost surely, 2^331240421 is an apocalyptic number.

It is an amenable number.

331240421 is a deficient number, since it is larger than the sum of its proper divisors (192871).

331240421 is a wasteful number, since it uses less digits than its factorization.

331240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192870.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 331240421 is about 18200.0115659304. The cubic root of 331240421 is about 691.9070822316.

Adding to 331240421 its reverse (124042133), we get a palindrome (455282554).

The spelling of 331240421 in words is "three hundred thirty-one million, two hundred forty thousand, four hundred twenty-one".