21404104052 has 12 divisors (see below), whose sum is σ = 37653294336. Its totient is φ = 10646019960.

The previous prime is 21404104049. The next prime is 21404104081. The reversal of 21404104052 is 25040140412.

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, 14007158 + ... + 14008685.

It is an arithmetic number, because the mean of its divisors is an integer number (3137774528).

Almost surely, 2^21404104052 is an apocalyptic number.

It is an amenable number.

21404104052 is a deficient number, since it is larger than the sum of its proper divisors (16249190284).

21404104052 is a wasteful number, since it uses less digits than its factorization.

21404104052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28016038 (or 28016036 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21404104052 its reverse (25040140412), we get a palindrome (46444244464).

The spelling of 21404104052 in words is "twenty-one billion, four hundred four million, one hundred four thousand, fifty-two".