21369004745 has 24 divisors (see below), whose sum is σ = 28196085120. Its totient is φ = 15535476000.

The previous prime is 21369004681. The next prime is 21369004747. The reversal of 21369004745 is 54740096312.

It is not a de Polignac number, because 21369004745 - 2⁶ = 21369004681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21369004747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2446496 + ... + 2455214.

It is an arithmetic number, because the mean of its divisors is an integer number (1174836880).

Almost surely, 2^21369004745 is an apocalyptic number.

It is an amenable number.

21369004745 is a deficient number, since it is larger than the sum of its proper divisors (6827080375).

21369004745 is a wasteful number, since it uses less digits than its factorization.

21369004745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12797 (or 12786 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 21369004745 in words is "twenty-one billion, three hundred sixty-nine million, four thousand, seven hundred forty-five".