21100122105 has 8 divisors (see below), whose sum is σ = 33760195392. Its totient is φ = 11253398448.

The previous prime is 21100122097. The next prime is 21100122107. The reversal of 21100122105 is 50122100112.

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

It is not a de Polignac number, because 21100122105 - 2³ = 21100122097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 1406674807 = 21100122105 / (2 + 1 + 1 + 0 + 0 + 1 + 2 + 2 + 1 + 0 + 5).

It is not an unprimeable number, because it can be changed into a prime (21100122107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703337389 + ... + 703337418.

It is an arithmetic number, because the mean of its divisors is an integer number (4220024424).

Almost surely, 2^21100122105 is an apocalyptic number.

It is an amenable number.

21100122105 is a deficient number, since it is larger than the sum of its proper divisors (12660073287).

21100122105 is a wasteful number, since it uses less digits than its factorization.

21100122105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406674815.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 21100122105 its reverse (50122100112), we get a palindrome (71222222217).

The spelling of 21100122105 in words is "twenty-one billion, one hundred million, one hundred twenty-two thousand, one hundred five".