21404503255053 has 16 divisors (see below), whose sum is σ = 28611425905920. Its totient is φ = 14233645767936.

The previous prime is 21404503255007. The next prime is 21404503255097. The reversal of 21404503255053 is 35055230540412.

It is not a de Polignac number, because 21404503255053 - 2⁶ = 21404503254989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404503205053) by changing a digit.

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, 1441276 + ... + 6699722.

It is an arithmetic number, because the mean of its divisors is an integer number (1788214119120).

Almost surely, 2^{21404503255053} is an apocalyptic number.

It is an amenable number.

21404503255053 is a deficient number, since it is larger than the sum of its proper divisors (7206922650867).

21404503255053 is a wasteful number, since it uses less digits than its factorization.

21404503255053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5261876.

The product of its (nonzero) digits is 360000, while the sum is 39.

Adding to 21404503255053 its reverse (35055230540412), we get a palindrome (56459733795465).

The spelling of 21404503255053 in words is "twenty-one trillion, four hundred four billion, five hundred three million, two hundred fifty-five thousand, fifty-three".