21005225303 has 8 divisors (see below), whose sum is σ = 21703516800. Its totient is φ = 20308227840.

The previous prime is 21005225299. The next prime is 21005225309. The reversal of 21005225303 is 30352250012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21005225303 - 2² = 21005225299 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21005225309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290450 + ... + 355487.

It is an arithmetic number, because the mean of its divisors is an integer number (2712939600).

Almost surely, 2^21005225303 is an apocalyptic number.

21005225303 is a deficient number, since it is larger than the sum of its proper divisors (698291497).

21005225303 is a wasteful number, since it uses less digits than its factorization.

21005225303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647017.

The product of its (nonzero) digits is 1800, while the sum is 23.

Adding to 21005225303 its reverse (30352250012), we get a palindrome (51357475315).

The spelling of 21005225303 in words is "twenty-one billion, five million, two hundred twenty-five thousand, three hundred three".