21002201206 has 8 divisors (see below), whose sum is σ = 36003773520. Its totient is φ = 9000943368.

The previous prime is 21002201179. The next prime is 21002201249. The reversal of 21002201206 is 60210220012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21002201206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750078601 + ... + 750078628.

It is an arithmetic number, because the mean of its divisors is an integer number (4500471690).

Almost surely, 2^21002201206 is an apocalyptic number.

21002201206 is a deficient number, since it is larger than the sum of its proper divisors (15001572314).

21002201206 is a wasteful number, since it uses less digits than its factorization.

21002201206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500157238.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21002201206 its reverse (60210220012), we get a palindrome (81212421218).

The spelling of 21002201206 in words is "twenty-one billion, two million, two hundred one thousand, two hundred six".