1204440021 has 48 divisors (see below), whose sum is σ = 1906907184. Its totient is φ = 729464832.

The previous prime is 1204439941. The next prime is 1204440023. The reversal of 1204440021 is 1200444021.

1204440021 is a `hidden beast` number, since 1 + 204 + 440 + 0 + 21 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 42380100 + 1162059921 = 6510^2 + 34089^2 .

It is not a de Polignac number, because 1204440021 - 2¹⁰ = 1204438997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1204439976 and 1204440003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1204440023) 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 in 47 ways as a sum of consecutive naturals, for example, 774781 + ... + 776333.

It is an arithmetic number, because the mean of its divisors is an integer number (39727233).

Almost surely, 2^1204440021 is an apocalyptic number.

It is an amenable number.

1204440021 is a deficient number, since it is larger than the sum of its proper divisors (702467163).

1204440021 is a wasteful number, since it uses less digits than its factorization.

1204440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750 (or 1747 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1204440021 is about 34705.0431637824. The cubic root of 1204440021 is about 1063.9675744942.

Adding to 1204440021 its reverse (1200444021), we get a palindrome (2404884042).

The spelling of 1204440021 in words is "one billion, two hundred four million, four hundred forty thousand, twenty-one".