21103331105 has 16 divisors (see below), whose sum is σ = 26523313920. Its totient is φ = 16088580288.

The previous prime is 21103331101. The next prime is 21103331111. The reversal of 21103331105 is 50113330112.

It is a cyclic number.

It is not a de Polignac number, because 21103331105 - 2² = 21103331101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21103331101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310157 + ... + 372026.

It is an arithmetic number, because the mean of its divisors is an integer number (1657707120).

Almost surely, 2^21103331105 is an apocalyptic number.

It is an amenable number.

21103331105 is a deficient number, since it is larger than the sum of its proper divisors (5419982815).

21103331105 is a wasteful number, since it uses less digits than its factorization.

21103331105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682480.

The product of its (nonzero) digits is 270, while the sum is 20.

Adding to 21103331105 its reverse (50113330112), we get a palindrome (71216661217).

The spelling of 21103331105 in words is "twenty-one billion, one hundred three million, three hundred thirty-one thousand, one hundred five".