10240421 has 4 divisors (see below), whose sum is σ = 10273452. Its totient is φ = 10207392.

The previous prime is 10240397. The next prime is 10240423. The reversal of 10240421 is 12404201.

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 4060225 + 6180196 = 2015^2 + 2486^2 .

It is a cyclic number.

It is not a de Polignac number, because 10240421 - 2⁶ = 10240357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10240396 and 10240405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10240423) 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, 16046 + ... + 16671.

It is an arithmetic number, because the mean of its divisors is an integer number (2568363).

Almost surely, 2^10240421 is an apocalyptic number.

It is an amenable number.

10240421 is a deficient number, since it is larger than the sum of its proper divisors (33031).

10240421 is an equidigital number, since it uses as much as digits as its factorization.

10240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33030.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 10240421 is about 3200.0657805739. The cubic root of 10240421 is about 217.1563852499.

Adding to 10240421 its reverse (12404201), we get a palindrome (22644622).

The spelling of 10240421 in words is "ten million, two hundred forty thousand, four hundred twenty-one".