21024454545 has 12 divisors (see below), whose sum is σ = 36442387956. Its totient is φ = 11213042400.

The previous prime is 21024454519. The next prime is 21024454553. The reversal of 21024454545 is 54545442012.

21024454545 is a `hidden beast` number, since 2 + 102 + 4 + 4 + 5 + 4 + 545 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9832507281 + 11191947264 = 99159^2 + 105792^2 .

It is not a de Polignac number, because 21024454545 - 2¹¹ = 21024452497 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233605006 + ... + 233605095.

It is an arithmetic number, because the mean of its divisors is an integer number (3036865663).

Almost surely, 2^21024454545 is an apocalyptic number.

It is an amenable number.

21024454545 is a deficient number, since it is larger than the sum of its proper divisors (15417933411).

21024454545 is a wasteful number, since it uses less digits than its factorization.

21024454545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467210112 (or 467210109 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 36.

Adding to 21024454545 its reverse (54545442012), we get a palindrome (75569896557).

The spelling of 21024454545 in words is "twenty-one billion, twenty-four million, four hundred fifty-four thousand, five hundred forty-five".