21040404002124 has 48 divisors (see below), whose sum is σ = 52873393261920. Its totient is φ = 6473647872000.

The previous prime is 21040404002089. The next prime is 21040404002141. The reversal of 21040404002124 is 42120040404012.

It is a super-2 number, since 2×21040404002124² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21040404002094 and 21040404002103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210127 + ... + 6490374.

It is an arithmetic number, because the mean of its divisors is an integer number (1101529026290).

Almost surely, 2^{21040404002124} is an apocalyptic number.

It is an amenable number.

21040404002124 is an abundant number, since it is smaller than the sum of its proper divisors (31832989259796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21040404002124 is a wasteful number, since it uses less digits than its factorization.

21040404002124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6720650 (or 6720648 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21040404002124 its reverse (42120040404012), we get a palindrome (63160444406136).

The spelling of 21040404002124 in words is "twenty-one trillion, forty billion, four hundred four million, two thousand, one hundred twenty-four".