21145832803 has 4 divisors (see below), whose sum is σ = 21383426520. Its totient is φ = 20908239088.

The previous prime is 21145832797. The next prime is 21145832863. The reversal of 21145832803 is 30823854112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21145832803 - 2¹³ = 21145824611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21145832863) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 118796725 + ... + 118796902.

It is an arithmetic number, because the mean of its divisors is an integer number (5345856630).

Almost surely, 2^21145832803 is an apocalyptic number.

21145832803 is a deficient number, since it is larger than the sum of its proper divisors (237593717).

21145832803 is an equidigital number, since it uses as much as digits as its factorization.

21145832803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237593716.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 21145832803 in words is "twenty-one billion, one hundred forty-five million, eight hundred thirty-two thousand, eight hundred three".