21203430006 has 16 divisors (see below), whose sum is σ = 46262029248. Its totient is φ = 6425281800.

The previous prime is 21203429987. The next prime is 21203430007. The reversal of 21203430006 is 60003430212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203430007) 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, 160631980 + ... + 160632111.

It is an arithmetic number, because the mean of its divisors is an integer number (2891376828).

Almost surely, 2^21203430006 is an apocalyptic number.

21203430006 is an abundant number, since it is smaller than the sum of its proper divisors (25058599242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203430006 is a wasteful number, since it uses less digits than its factorization.

21203430006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321264107.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21203430006 its reverse (60003430212), we get a palindrome (81206860218).

The spelling of 21203430006 in words is "twenty-one billion, two hundred three million, four hundred thirty thousand, six".