21220220011 has 4 divisors (see below), whose sum is σ = 21225717072. Its totient is φ = 21214722952.

The previous prime is 21220219973. The next prime is 21220220017. The reversal of 21220220011 is 11002202212.

It is a happy number.

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 21220220011 - 2⁷ = 21220219883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220219973 and 21220220000.

It is not an unprimeable number, because it can be changed into a prime (21220220017) 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, 2742736 + ... + 2750461.

It is an arithmetic number, because the mean of its divisors is an integer number (5306429268).

Almost surely, 2^21220220011 is an apocalyptic number.

21220220011 is a deficient number, since it is larger than the sum of its proper divisors (5497061).

21220220011 is an equidigital number, since it uses as much as digits as its factorization.

21220220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5497060.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21220220011 its reverse (11002202212), we get a palindrome (32222422223).

The spelling of 21220220011 in words is "twenty-one billion, two hundred twenty million, two hundred twenty thousand, eleven".