21320004124 has 48 divisors (see below), whose sum is σ = 38971548000. Its totient is φ = 10192847616.

The previous prime is 21320004119. The next prime is 21320004133. The reversal of 21320004124 is 42140002312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6445279 + ... + 6448585.

It is an arithmetic number, because the mean of its divisors is an integer number (811907250).

Almost surely, 2^21320004124 is an apocalyptic number.

It is an amenable number.

21320004124 is a deficient number, since it is larger than the sum of its proper divisors (17651543876).

21320004124 is a wasteful number, since it uses less digits than its factorization.

21320004124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3862 (or 3860 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21320004124 its reverse (42140002312), we get a palindrome (63460006436).

The spelling of 21320004124 in words is "twenty-one billion, three hundred twenty million, four thousand, one hundred twenty-four".