21102101206 has 8 divisors (see below), whose sum is σ = 31684903200. Its totient is φ = 10540466808.

The previous prime is 21102101201. The next prime is 21102101269. The reversal of 21102101206 is 60210120112.

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 21102101206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102101201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5289406 + ... + 5293393.

It is an arithmetic number, because the mean of its divisors is an integer number (3960612900).

Almost surely, 2^21102101206 is an apocalyptic number.

21102101206 is a deficient number, since it is larger than the sum of its proper divisors (10582801994).

21102101206 is a wasteful number, since it uses less digits than its factorization.

21102101206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10583798.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21102101206 its reverse (60210120112), we get a palindrome (81312221318).

The spelling of 21102101206 in words is "twenty-one billion, one hundred two million, one hundred one thousand, two hundred six".