221221021210211 has 4 divisors (see below), whose sum is σ = 241332023138424. Its totient is φ = 201110019282000.

The previous prime is 221221021210181. The next prime is 221221021210229. The reversal of 221221021210211 is 112012120122122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221221021210211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221021213211) 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, 10055500964090 + ... + 10055500964111.

It is an arithmetic number, because the mean of its divisors is an integer number (60333005784606).

Almost surely, 2^{221221021210211} is an apocalyptic number.

221221021210211 is a deficient number, since it is larger than the sum of its proper divisors (20111001928213).

221221021210211 is a wasteful number, since it uses less digits than its factorization.

221221021210211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20111001928212.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221221021210211 its reverse (112012120122122), we get a palindrome (333233141332333).

The spelling of 221221021210211 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred ten thousand, two hundred eleven".