201111212221 has 8 divisors (see below), whose sum is σ = 203126222304. Its totient is φ = 199096669200.

The previous prime is 201111212201. The next prime is 201111212243. The reversal of 201111212221 is 122212111102.

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 201111212221 - 2¹¹ = 201111210173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201111212195 and 201111212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111212201) 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, 783286 + ... + 1007848.

It is an arithmetic number, because the mean of its divisors is an integer number (25390777788).

Almost surely, 2^201111212221 is an apocalyptic number.

It is an amenable number.

201111212221 is a deficient number, since it is larger than the sum of its proper divisors (2015010083).

201111212221 is a wasteful number, since it uses less digits than its factorization.

201111212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233531.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201111212221 its reverse (122212111102), we get a palindrome (323323323323).

The spelling of 201111212221 in words is "two hundred one billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty-one".