21004440124 has 12 divisors (see below), whose sum is σ = 37360357048. Its totient is φ = 10330052400.

The previous prime is 21004440101. The next prime is 21004440133. The reversal of 21004440124 is 42104440012.

It is a super-2 number, since 2×21004440124² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21004440095 and 21004440104.

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, 43041642 + ... + 43042129.

Almost surely, 2^21004440124 is an apocalyptic number.

It is an amenable number.

21004440124 is a deficient number, since it is larger than the sum of its proper divisors (16355916924).

21004440124 is a wasteful number, since it uses less digits than its factorization.

21004440124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86083836 (or 86083834 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21004440124 its reverse (42104440012), we get a palindrome (63108880136).

The spelling of 21004440124 in words is "twenty-one billion, four million, four hundred forty thousand, one hundred twenty-four".