21220110011 has 4 divisors (see below), whose sum is σ = 21224626752. Its totient is φ = 21215593272.

The previous prime is 21220110007. The next prime is 21220110031. The reversal of 21220110011 is 11001102212.

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 21220110011 - 2² = 21220110007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220109974 and 21220110001.

It is not an unprimeable number, because it can be changed into a prime (21220110031) 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, 2251316 + ... + 2260721.

It is an arithmetic number, because the mean of its divisors is an integer number (5306156688).

Almost surely, 2^21220110011 is an apocalyptic number.

21220110011 is a deficient number, since it is larger than the sum of its proper divisors (4516741).

21220110011 is an equidigital number, since it uses as much as digits as its factorization.

21220110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516740.

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

Adding to 21220110011 its reverse (11001102212), we get a palindrome (32221212223).

The spelling of 21220110011 in words is "twenty-one billion, two hundred twenty million, one hundred ten thousand, eleven".