21321606603 has 8 divisors (see below), whose sum is σ = 31013246016. Its totient is φ = 12922185800.

The previous prime is 21321606587. The next prime is 21321606629. The reversal of 21321606603 is 30660612312.

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 21321606603 - 2⁴ = 21321606587 is a prime.

It is a super-2 number, since 2×21321606603² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21321605603) 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, 323054613 + ... + 323054678.

It is an arithmetic number, because the mean of its divisors is an integer number (3876655752).

Almost surely, 2^21321606603 is an apocalyptic number.

21321606603 is a deficient number, since it is larger than the sum of its proper divisors (9691639413).

21321606603 is a wasteful number, since it uses less digits than its factorization.

21321606603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646109305.

The product of its (nonzero) digits is 7776, while the sum is 30.

The spelling of 21321606603 in words is "twenty-one billion, three hundred twenty-one million, six hundred six thousand, six hundred three".