21416545553 has 8 divisors (see below), whose sum is σ = 23197292328. Its totient is φ = 19654844544.

The previous prime is 21416545541. The next prime is 21416545561. The reversal of 21416545553 is 35554561412.

It can be written as a sum of positive squares in 4 ways, for example, as 4028694784 + 17387850769 = 63472^2 + 131863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21416545553 - 2⁴ = 21416545537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21416545553.

It is not an unprimeable number, because it can be changed into a prime (21416515553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4759100 + ... + 4763597.

It is an arithmetic number, because the mean of its divisors is an integer number (2899661541).

Almost surely, 2^21416545553 is an apocalyptic number.

It is an amenable number.

21416545553 is a deficient number, since it is larger than the sum of its proper divisors (1780746775).

21416545553 is a wasteful number, since it uses less digits than its factorization.

21416545553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9522883.

The product of its digits is 360000, while the sum is 41.

The spelling of 21416545553 in words is "twenty-one billion, four hundred sixteen million, five hundred forty-five thousand, five hundred fifty-three".