21020220000105 has 16 divisors (see below), whose sum is σ = 33723993295104. Its totient is φ = 11180236901760.

The previous prime is 21020220000097. The next prime is 21020220000127. The reversal of 21020220000105 is 50100002202012.

It is not a de Polignac number, because 21020220000105 - 2³ = 21020220000097 is a prime.

It is a super-3 number, since 3×21020220000105³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1909187956 + ... + 1909198965.

It is an arithmetic number, because the mean of its divisors is an integer number (2107749580944).

Almost surely, 2^{21020220000105} is an apocalyptic number.

It is an amenable number.

21020220000105 is a deficient number, since it is larger than the sum of its proper divisors (12703773294999).

21020220000105 is a wasteful number, since it uses less digits than its factorization.

21020220000105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818387296.

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 21020220000105 its reverse (50100002202012), we get a palindrome (71120222202117).

The spelling of 21020220000105 in words is "twenty-one trillion, twenty billion, two hundred twenty million, one hundred five", and thus it is an aban number.