21110220011 has 4 divisors (see below), whose sum is σ = 21184814712. Its totient is φ = 21035625312.

The previous prime is 21110219993. The next prime is 21110220029. The reversal of 21110220011 is 11002201112.

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

It is an interprime number because it is at equal distance from previous prime (21110219993) and next prime (21110220029).

It is a cyclic number.

It is not a de Polignac number, because 21110220011 - 2¹⁸ = 21109957867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110219974 and 21110220001.

It is not an unprimeable number, because it can be changed into a prime (21110220511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37296926 + ... + 37297491.

It is an arithmetic number, because the mean of its divisors is an integer number (5296203678).

Almost surely, 2^21110220011 is an apocalyptic number.

21110220011 is a deficient number, since it is larger than the sum of its proper divisors (74594701).

21110220011 is an equidigital number, since it uses as much as digits as its factorization.

21110220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74594700.

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

Adding to 21110220011 its reverse (11002201112), we get a palindrome (32112421123).

The spelling of 21110220011 in words is "twenty-one billion, one hundred ten million, two hundred twenty thousand, eleven".