440002021 has 2 divisors, whose sum is σ = 440002022. Its totient is φ = 440002020.

The previous prime is 440002009. The next prime is 440002033. The reversal of 440002021 is 120200044.

It is a balanced prime because it is at equal distance from previous prime (440002009) and next prime (440002033).

It can be written as a sum of positive squares in only one way, i.e., 439740900 + 261121 = 20970^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 440002021 - 2¹⁵ = 439969253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 440001992 and 440002010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440002051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220001010 + 220001011.

It is an arithmetic number, because the mean of its divisors is an integer number (220001011).

Almost surely, 2^440002021 is an apocalyptic number.

It is an amenable number.

440002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

440002021 is an equidigital number, since it uses as much as digits as its factorization.

440002021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 440002021 is about 20976.2251370450. The cubic root of 440002021 is about 760.5916566606.

Adding to 440002021 its reverse (120200044), we get a palindrome (560202065).

The spelling of 440002021 in words is "four hundred forty million, two thousand, twenty-one".