21004131224 has 16 divisors (see below), whose sum is σ = 40298624520. Its totient is φ = 10257831360.

The previous prime is 21004131217. The next prime is 21004131289. The reversal of 21004131224 is 42213140012.

It is a junction number, because it is equal to n+sod(n) for n = 21004131196 and 21004131205.

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 in 3 ways as a sum of consecutive naturals, for example, 30528917 + ... + 30529604.

Almost surely, 2^21004131224 is an apocalyptic number.

It is an amenable number.

21004131224 is a deficient number, since it is larger than the sum of its proper divisors (19294493296).

21004131224 is a wasteful number, since it uses less digits than its factorization.

21004131224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61058570 (or 61058566 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21004131224 its reverse (42213140012), we get a palindrome (63217271236).

The spelling of 21004131224 in words is "twenty-one billion, four million, one hundred thirty-one thousand, two hundred twenty-four".