22404404021 has 12 divisors (see below), whose sum is σ = 24284731212. Its totient is φ = 20651557824.

The previous prime is 22404404003. The next prime is 22404404047. The reversal of 22404404021 is 12040440422.

It can be written as a sum of positive squares in 2 ways, for example, as 16599487921 + 5804916100 = 128839^2 + 76190^2 .

It is not a de Polignac number, because 22404404021 - 2¹⁴ = 22404387637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22404404051) 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 11 ways as a sum of consecutive naturals, for example, 825320 + ... + 852033.

It is an arithmetic number, because the mean of its divisors is an integer number (2023727601).

Almost surely, 2^22404404021 is an apocalyptic number.

It is an amenable number.

22404404021 is a deficient number, since it is larger than the sum of its proper divisors (1880327191).

22404404021 is a wasteful number, since it uses less digits than its factorization.

22404404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677428 (or 1677409 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 22404404021 its reverse (12040440422), we get a palindrome (34444844443).

The spelling of 22404404021 in words is "twenty-two billion, four hundred four million, four hundred four thousand, twenty-one".