21102022105 has 8 divisors (see below), whose sum is σ = 25346299464. Its totient is φ = 16865702400.

The previous prime is 21102022087. The next prime is 21102022111. The reversal of 21102022105 is 50122020112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6905776201 + 14196245904 = 83101^2 + 119148^2 .

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

It is not a de Polignac number, because 21102022105 - 2¹¹ = 21102020057 is a prime.

It is a Duffinian number.

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, 1983576 + ... + 1994185.

It is an arithmetic number, because the mean of its divisors is an integer number (3168287433).

Almost surely, 2^21102022105 is an apocalyptic number.

It is an amenable number.

21102022105 is a deficient number, since it is larger than the sum of its proper divisors (4244277359).

21102022105 is a wasteful number, since it uses less digits than its factorization.

21102022105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978827.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 21102022105 its reverse (50122020112), we get a palindrome (71224042217).

The spelling of 21102022105 in words is "twenty-one billion, one hundred two million, twenty-two thousand, one hundred five".