221020211011 has 4 divisors (see below), whose sum is σ = 234021399912. Its totient is φ = 208019022112.

The previous prime is 221020210969. The next prime is 221020211017. The reversal of 221020211011 is 110112020122.

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 221020211011 - 2²⁷ = 220885993283 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020210982 and 221020211000.

It is not an unprimeable number, because it can be changed into a prime (221020211017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6500594425 + ... + 6500594458.

It is an arithmetic number, because the mean of its divisors is an integer number (58505349978).

Almost surely, 2^221020211011 is an apocalyptic number.

221020211011 is a deficient number, since it is larger than the sum of its proper divisors (13001188901).

221020211011 is a wasteful number, since it uses less digits than its factorization.

221020211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13001188900.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221020211011 its reverse (110112020122), we get a palindrome (331132231133).

The spelling of 221020211011 in words is "two hundred twenty-one billion, twenty million, two hundred eleven thousand, eleven".