1000442021 has 2 divisors, whose sum is σ = 1000442022. Its totient is φ = 1000442020.

The previous prime is 1000442011. The next prime is 1000442059. The reversal of 1000442021 is 1202440001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 923248225 + 77193796 = 30385^2 + 8786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000442021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000441987 and 1000442005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000442011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500221010 + 500221011.

It is an arithmetic number, because the mean of its divisors is an integer number (500221011).

Almost surely, 2^1000442021 is an apocalyptic number.

It is an amenable number.

1000442021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000442021 is an equidigital number, since it uses as much as digits as its factorization.

1000442021 is an evil number, because the sum of its binary digits is even.

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

The square root of 1000442021 is about 31629.7647952052. The cubic root of 1000442021 is about 1000.1473186295.

Adding to 1000442021 its reverse (1202440001), we get a palindrome (2202882022).

It can be divided in two parts, 10004 and 42021, that added together give a palindrome (52025).

The spelling of 1000442021 in words is "one billion, four hundred forty-two thousand, twenty-one".