21214036504455 has 16 divisors (see below), whose sum is σ = 34015140342144. Its totient is φ = 11289925490720.

The previous prime is 21214036504447. The next prime is 21214036504513. The reversal of 21214036504455 is 55440563041212.

It is not a de Polignac number, because 21214036504455 - 2³ = 21214036504447 is a prime.

It is a congruent number.

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, 1514199741 + ... + 1514213750.

It is an arithmetic number, because the mean of its divisors is an integer number (2125946271384).

Almost surely, 2^{21214036504455} is an apocalyptic number.

21214036504455 is a deficient number, since it is larger than the sum of its proper divisors (12801103837689).

21214036504455 is a wasteful number, since it uses less digits than its factorization.

21214036504455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028413966.

The product of its (nonzero) digits is 576000, while the sum is 42.

Adding to 21214036504455 its reverse (55440563041212), we get a palindrome (76654599545667).

The spelling of 21214036504455 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred four thousand, four hundred fifty-five".