201211111011221 has 8 divisors (see below), whose sum is σ = 203168443726080. Its totient is φ = 199262736341488.

The previous prime is 201211111011217. The next prime is 201211111011241. The reversal of 201211111011221 is 122110111112102.

201211111011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 201211111011221 - 2² = 201211111011217 is a prime.

It is a super-2 number, since 2×201211111011221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201211111011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211111011241) 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, 2239466141 + ... + 2239555986.

It is an arithmetic number, because the mean of its divisors is an integer number (25396055465760).

Almost surely, 2^{201211111011221} is an apocalyptic number.

It is an amenable number.

201211111011221 is a deficient number, since it is larger than the sum of its proper divisors (1957332714859).

201211111011221 is a wasteful number, since it uses less digits than its factorization.

201211111011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4479022563.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 201211111011221 its reverse (122110111112102), we get a palindrome (323321222123323).

The spelling of 201211111011221 in words is "two hundred one trillion, two hundred eleven billion, one hundred eleven million, eleven thousand, two hundred twenty-one".