21003224024 has 8 divisors (see below), whose sum is σ = 39381045060. Its totient is φ = 10501612008.

The previous prime is 21003223993. The next prime is 21003224057. The reversal of 21003224024 is 42042230012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21003224024² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003223987 and 21003224005.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1312701494 + ... + 1312701509.

Almost surely, 2^21003224024 is an apocalyptic number.

It is an amenable number.

21003224024 is a deficient number, since it is larger than the sum of its proper divisors (18377821036).

21003224024 is a wasteful number, since it uses less digits than its factorization.

21003224024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625403009 (or 2625403005 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21003224024 its reverse (42042230012), we get a palindrome (63045454036).

The spelling of 21003224024 in words is "twenty-one billion, three million, two hundred twenty-four thousand, twenty-four".