21416664453 has 32 divisors (see below), whose sum is σ = 29553119232. Its totient is φ = 13785292800.

The previous prime is 21416664391. The next prime is 21416664461. The reversal of 21416664453 is 35446661412.

It is not a de Polignac number, because 21416664453 - 2²⁹ = 20879793541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416664653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12877500 + ... + 12879162.

It is an arithmetic number, because the mean of its divisors is an integer number (923534976).

Almost surely, 2^21416664453 is an apocalyptic number.

It is an amenable number.

21416664453 is a deficient number, since it is larger than the sum of its proper divisors (8136454779).

21416664453 is a wasteful number, since it uses less digits than its factorization.

21416664453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525.

The product of its digits is 414720, while the sum is 42.

The spelling of 21416664453 in words is "twenty-one billion, four hundred sixteen million, six hundred sixty-four thousand, four hundred fifty-three".