21004545355 has 16 divisors (see below), whose sum is σ = 25906937760. Its totient is φ = 16336691712.

The previous prime is 21004545329. The next prime is 21004545377. The reversal of 21004545355 is 55354540012.

It is a cyclic number.

It is not a de Polignac number, because 21004545355 - 2¹³ = 21004537163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21004545355.

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, 196176 + ... + 283714.

It is an arithmetic number, because the mean of its divisors is an integer number (1619183610).

Almost surely, 2^21004545355 is an apocalyptic number.

21004545355 is a deficient number, since it is larger than the sum of its proper divisors (4902392405).

21004545355 is a wasteful number, since it uses less digits than its factorization.

21004545355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88878.

The product of its (nonzero) digits is 60000, while the sum is 34.

The spelling of 21004545355 in words is "twenty-one billion, four million, five hundred forty-five thousand, three hundred fifty-five".