21101100122 has 8 divisors (see below), whose sum is σ = 31736508276. Its totient is φ = 10522264032.

The previous prime is 21101100109. The next prime is 21101100127. The reversal of 21101100122 is 22100110112.

It can be written as a sum of positive squares in 2 ways, for example, as 20618375281 + 482724841 = 143591^2 + 21971^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21101100127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14142083 + ... + 14143574.

Almost surely, 2^21101100122 is an apocalyptic number.

21101100122 is a deficient number, since it is larger than the sum of its proper divisors (10635408154).

21101100122 is a wasteful number, since it uses less digits than its factorization.

21101100122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28286032.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21101100122 its reverse (22100110112), we get a palindrome (43201210234).

The spelling of 21101100122 in words is "twenty-one billion, one hundred one million, one hundred thousand, one hundred twenty-two".