10440021 has 4 divisors (see below), whose sum is σ = 13920032. Its totient is φ = 6960012.

The previous prime is 10440019. The next prime is 10440037. The reversal of 10440021 is 12004401.

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 an emirpimes, since its reverse is a distinct semiprime: 12004401 = 3 ⋅4001467.

It is not a de Polignac number, because 10440021 - 2¹ = 10440019 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10439979 and 10440006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10440011) 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, 1740001 + ... + 1740006.

It is an arithmetic number, because the mean of its divisors is an integer number (3480008).

Almost surely, 2^10440021 is an apocalyptic number.

It is an amenable number.

10440021 is a deficient number, since it is larger than the sum of its proper divisors (3480011).

10440021 is an equidigital number, since it uses as much as digits as its factorization.

10440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480010.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 10440021 is about 3231.1021339475. The cubic root of 10440021 is about 218.5582094737.

Adding to 10440021 its reverse (12004401), we get a palindrome (22444422).

The spelling of 10440021 in words is "ten million, four hundred forty thousand, twenty-one".