11111020221 has 8 divisors (see below), whose sum is σ = 16931078464. Its totient is φ = 6349154400.

The previous prime is 11111020211. The next prime is 11111020237. The reversal of 11111020221 is 12202011111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11111020221 - 2⁵ = 11111020189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11111020197 and 11111020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111020211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264548080 + ... + 264548121.

It is an arithmetic number, because the mean of its divisors is an integer number (2116384808).

Almost surely, 2^11111020221 is an apocalyptic number.

It is an amenable number.

11111020221 is a deficient number, since it is larger than the sum of its proper divisors (5820058243).

11111020221 is an equidigital number, since it uses as much as digits as its factorization.

11111020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529096211.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11111020221 its reverse (12202011111), we get a palindrome (23313031332).

The spelling of 11111020221 in words is "eleven billion, one hundred eleven million, twenty thousand, two hundred twenty-one".