21102028105 has 8 divisors (see below), whose sum is σ = 25327411200. Its totient is φ = 16878304176.

The previous prime is 21102028091. The next prime is 21102028111. The reversal of 21102028105 is 50182020112.

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 21102028105 - 2⁹ = 21102027593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386635 + ... + 437824.

It is an arithmetic number, because the mean of its divisors is an integer number (3165926400).

Almost surely, 2^21102028105 is an apocalyptic number.

It is an amenable number.

21102028105 is a deficient number, since it is larger than the sum of its proper divisors (4225383095).

21102028105 is an equidigital number, since it uses as much as digits as its factorization.

21102028105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829583.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 21102028105 its reverse (50182020112), we get a palindrome (71284048217).

The spelling of 21102028105 in words is "twenty-one billion, one hundred two million, twenty-eight thousand, one hundred five".