10440421 has 4 divisors (see below), whose sum is σ = 10448352. Its totient is φ = 10432492.

The previous prime is 10440383. The next prime is 10440427. The reversal of 10440421 is 12404401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10440421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10440395 and 10440404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10440427) 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, 1465 + ... + 4798.

It is an arithmetic number, because the mean of its divisors is an integer number (2612088).

Almost surely, 2^10440421 is an apocalyptic number.

It is an amenable number.

10440421 is a deficient number, since it is larger than the sum of its proper divisors (7931).

10440421 is an equidigital number, since it uses as much as digits as its factorization.

10440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7930.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 10440421 is about 3231.1640317384. The cubic root of 10440421 is about 218.5610007251.

Adding to 10440421 its reverse (12404401), we get a palindrome (22844822).

The spelling of 10440421 in words is "ten million, four hundred forty thousand, four hundred twenty-one".