221020201111 has 8 divisors (see below), whose sum is σ = 226244429840. Its totient is φ = 215799800832.

The previous prime is 221020201067. The next prime is 221020201139. The reversal of 221020201111 is 111102020122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020201111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020201091 and 221020201100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020201711) 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, 840120 + ... + 1071373.

It is an arithmetic number, because the mean of its divisors is an integer number (28280553730).

Almost surely, 2^221020201111 is an apocalyptic number.

221020201111 is a deficient number, since it is larger than the sum of its proper divisors (5224228729).

221020201111 is a wasteful number, since it uses less digits than its factorization.

221020201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914225.

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

Adding to 221020201111 its reverse (111102020122), we get a palindrome (332122221233).

The spelling of 221020201111 in words is "two hundred twenty-one billion, twenty million, two hundred one thousand, one hundred eleven".