1204441021 has 12 divisors (see below), whose sum is σ = 1449399420. Its totient is φ = 996777600.

The previous prime is 1204441013. The next prime is 1204441039. The reversal of 1204441021 is 1201444021.

It can be written as a sum of positive squares in 2 ways, for example, as 222308100 + 982132921 = 14910^2 + 31339^2 .

It is not a de Polignac number, because 1204441021 - 2³ = 1204441013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1204441021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1204441921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 422380 + ... + 425221.

It is an arithmetic number, because the mean of its divisors is an integer number (120783285).

Almost surely, 2^1204441021 is an apocalyptic number.

It is an amenable number.

1204441021 is a deficient number, since it is larger than the sum of its proper divisors (244958399).

1204441021 is an equidigital number, since it uses as much as digits as its factorization.

1204441021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847644 (or 847637 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1204441021 is about 34705.0575709074. The cubic root of 1204441021 is about 1063.9678689512.

Adding to 1204441021 its reverse (1201444021), we get a palindrome (2405885042).

It can be divided in two parts, 1204 and 441021, that added together give a square (442225 = 665²).

The spelling of 1204441021 in words is "one billion, two hundred four million, four hundred forty-one thousand, twenty-one".