21300545 has 24 divisors (see below), whose sum is σ = 29942784. Its totient is φ = 14503776.

The previous prime is 21300527. The next prime is 21300551. The reversal of 21300545 is 54500312.

21300545 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 21300545 - 2⁶ = 21300481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55424 + ... + 55806.

It is an arithmetic number, because the mean of its divisors is an integer number (1247616).

Almost surely, 2^21300545 is an apocalyptic number.

It is an amenable number.

21300545 is a deficient number, since it is larger than the sum of its proper divisors (8642239).

21300545 is a wasteful number, since it uses less digits than its factorization.

21300545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21300545 is about 4615.2513474349. The cubic root of 21300545 is about 277.2023483799.

Adding to 21300545 its reverse (54500312), we get a palindrome (75800857).

The spelling of 21300545 in words is "twenty-one million, three hundred thousand, five hundred forty-five".