21204211603 has 8 divisors (see below), whose sum is σ = 22698532800. Its totient is φ = 19747721448.

The previous prime is 21204211591. The next prime is 21204211663. The reversal of 21204211603 is 30611240212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21204211603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21204211663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9456601 + ... + 9458842.

It is an arithmetic number, because the mean of its divisors is an integer number (2837316600).

Almost surely, 2^21204211603 is an apocalyptic number.

21204211603 is a deficient number, since it is larger than the sum of its proper divisors (1494321197).

21204211603 is a wasteful number, since it uses less digits than its factorization.

21204211603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18915521.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21204211603 its reverse (30611240212), we get a palindrome (51815451815).

The spelling of 21204211603 in words is "twenty-one billion, two hundred four million, two hundred eleven thousand, six hundred three".