21004143124 has 24 divisors (see below), whose sum is σ = 38462751488. Its totient is φ = 10024067520.

The previous prime is 21004143109. The next prime is 21004143131. The reversal of 21004143124 is 42134140012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21004143095 and 21004143104.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1151142 + ... + 1169245.

Almost surely, 2^21004143124 is an apocalyptic number.

It is an amenable number.

21004143124 is a deficient number, since it is larger than the sum of its proper divisors (17458608364).

21004143124 is a wasteful number, since it uses less digits than its factorization.

21004143124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320495 (or 2320493 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21004143124 its reverse (42134140012), we get a palindrome (63138283136).

The spelling of 21004143124 in words is "twenty-one billion, four million, one hundred forty-three thousand, one hundred twenty-four".