21104545 has 48 divisors (see below), whose sum is σ = 33094656. Its totient is φ = 12768000.

The previous prime is 21104543. The next prime is 21104549. The reversal of 21104545 is 54540112.

It is not a de Polignac number, because 21104545 - 2¹ = 21104543 is a prime.

21104545 is a modest number, since divided by 4545 gives 2110 as remainder.

It is not an unprimeable number, because it can be changed into a prime (21104543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110400 + ... + 110590.

It is an arithmetic number, because the mean of its divisors is an integer number (689472).

Almost surely, 2^21104545 is an apocalyptic number.

It is an amenable number.

21104545 is a deficient number, since it is larger than the sum of its proper divisors (11990111).

21104545 is a wasteful number, since it uses less digits than its factorization.

21104545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 21104545 is about 4593.9683281451. The cubic root of 21104545 is about 276.3494881318.

Adding to 21104545 its reverse (54540112), we get a palindrome (75644657).

The spelling of 21104545 in words is "twenty-one million, one hundred four thousand, five hundred forty-five".