21003321224 has 16 divisors (see below), whose sum is σ = 40739201100. Its totient is φ = 10139534272.

The previous prime is 21003321223. The next prime is 21003321239. The reversal of 21003321224 is 42212330012.

It can be written as a sum of positive squares in 2 ways, for example, as 19765548100 + 1237773124 = 140590^2 + 35182^2 .

It is a super-2 number, since 2×21003321224² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003321196 and 21003321205.

It is not an unprimeable number, because it can be changed into a prime (21003321223) 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 3 ways as a sum of consecutive naturals, for example, 45265547 + ... + 45266010.

Almost surely, 2^21003321224 is an apocalyptic number.

It is an amenable number.

21003321224 is a deficient number, since it is larger than the sum of its proper divisors (19735879876).

21003321224 is a wasteful number, since it uses less digits than its factorization.

21003321224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90531592 (or 90531588 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21003321224 its reverse (42212330012), we get a palindrome (63215651236).

The spelling of 21003321224 in words is "twenty-one billion, three million, three hundred twenty-one thousand, two hundred twenty-four".