240320421 has 24 divisors (see below), whose sum is σ = 387500256. Its totient is φ = 142259040.

The previous prime is 240320413. The next prime is 240320459. The reversal of 240320421 is 124023042.

240320421 is a `hidden beast` number, since 240 + 3 + 2 + 0 + 421 = 666.

It is not a de Polignac number, because 240320421 - 2³ = 240320413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 240320394 and 240320403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240320021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23970 + ... + 32483.

It is an arithmetic number, because the mean of its divisors is an integer number (16145844).

Almost surely, 2^240320421 is an apocalyptic number.

It is an amenable number.

240320421 is a deficient number, since it is larger than the sum of its proper divisors (147179835).

240320421 is a wasteful number, since it uses less digits than its factorization.

240320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56513 (or 56510 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 240320421 is about 15502.2714787221. The cubic root of 240320421 is about 621.7229400225.

Adding to 240320421 its reverse (124023042), we get a palindrome (364343463).

The spelling of 240320421 in words is "two hundred forty million, three hundred twenty thousand, four hundred twenty-one".