221201011111 has 8 divisors (see below), whose sum is σ = 234228782160. Its totient is φ = 208175011968.

The previous prime is 221201011093. The next prime is 221201011153. The reversal of 221201011111 is 111110102122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221201011111 - 2²¹ = 221198913959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221201011091 and 221201011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201011711) 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, 181536 + ... + 689461.

It is an arithmetic number, because the mean of its divisors is an integer number (29278597770).

Almost surely, 2^221201011111 is an apocalyptic number.

221201011111 is a deficient number, since it is larger than the sum of its proper divisors (13027771049).

221201011111 is a wasteful number, since it uses less digits than its factorization.

221201011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885953.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221201011111 its reverse (111110102122), we get a palindrome (332311113233).

The spelling of 221201011111 in words is "two hundred twenty-one billion, two hundred one million, eleven thousand, one hundred eleven".