440021021 has 8 divisors (see below), whose sum is σ = 491186784. Its totient is φ = 390715920.

The previous prime is 440021017. The next prime is 440021053. The reversal of 440021021 is 120120044.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 440021021 - 2² = 440021017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 440020987 and 440021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464666 + ... + 465611.

It is an arithmetic number, because the mean of its divisors is an integer number (61398348).

Almost surely, 2^440021021 is an apocalyptic number.

It is an amenable number.

440021021 is a deficient number, since it is larger than the sum of its proper divisors (51165763).

440021021 is a wasteful number, since it uses less digits than its factorization.

440021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930331.

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

The square root of 440021021 is about 20976.6780258458. The cubic root of 440021021 is about 760.6026043630.

Adding to 440021021 its reverse (120120044), we get a palindrome (560141065).

The spelling of 440021021 in words is "four hundred forty million, twenty-one thousand, twenty-one".