21024004124 has 12 divisors (see below), whose sum is σ = 36800127000. Its totient is φ = 10509682128.

The previous prime is 21024004103. The next prime is 21024004163. The reversal of 21024004124 is 42140042012.

It is a junction number, because it is equal to n+sod(n) for n = 21024004096 and 21024004105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559514 + ... + 595905.

It is an arithmetic number, because the mean of its divisors is an integer number (3066677250).

Almost surely, 2^21024004124 is an apocalyptic number.

It is an amenable number.

21024004124 is a deficient number, since it is larger than the sum of its proper divisors (15776122876).

21024004124 is a wasteful number, since it uses less digits than its factorization.

21024004124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159972 (or 1159970 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21024004124 its reverse (42140042012), we get a palindrome (63164046136).

The spelling of 21024004124 in words is "twenty-one billion, twenty-four million, four thousand, one hundred twenty-four".