21103522211 has 4 divisors (see below), whose sum is σ = 21784281024. Its totient is φ = 20422763400.

The previous prime is 21103522207. The next prime is 21103522291. The reversal of 21103522211 is 11222530112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21103522211 - 2² = 21103522207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103522291) 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, 340379360 + ... + 340379421.

It is an arithmetic number, because the mean of its divisors is an integer number (5446070256).

Almost surely, 2^21103522211 is an apocalyptic number.

21103522211 is a deficient number, since it is larger than the sum of its proper divisors (680758813).

21103522211 is an equidigital number, since it uses as much as digits as its factorization.

21103522211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680758812.

The product of its (nonzero) digits is 240, while the sum is 20.

The spelling of 21103522211 in words is "twenty-one billion, one hundred three million, five hundred twenty-two thousand, two hundred eleven".