221011211221211 has 4 divisors (see below), whose sum is σ = 221160241034712. Its totient is φ = 220862181407712.

The previous prime is 221011211221193. The next prime is 221011211221267. The reversal of 221011211221211 is 112122112110122.

It is a happy number.

221011211221211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221011211221211 - 2⁶ = 221011211221147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221011211223211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74514904526 + ... + 74514907491.

It is an arithmetic number, because the mean of its divisors is an integer number (55290060258678).

Almost surely, 2^{221011211221211} is an apocalyptic number.

221011211221211 is a deficient number, since it is larger than the sum of its proper divisors (149029813501).

221011211221211 is a wasteful number, since it uses less digits than its factorization.

221011211221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149029813500.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 221011211221211 its reverse (112122112110122), we get a palindrome (333133323331333).

It can be divided in two parts, 22101121 and 1221211, that added together give a palindrome (23322332).

The spelling of 221011211221211 in words is "two hundred twenty-one trillion, eleven billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eleven".