211221222210221 has 8 divisors (see below), whose sum is σ = 211290547401024. Its totient is φ = 211151900576160.

The previous prime is 211221222210169. The next prime is 211221222210263. The reversal of 211221222210221 is 122012222122112.

211221222210221 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 a de Polignac number, because none of the positive numbers 2^k-211221222210221 is a prime.

It is a super-2 number, since 2×211221222210221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221222410221) 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, 120622280 + ... + 122360846.

It is an arithmetic number, because the mean of its divisors is an integer number (26411318425128).

Almost surely, 2^{211221222210221} is an apocalyptic number.

It is an amenable number.

211221222210221 is a deficient number, since it is larger than the sum of its proper divisors (69325190803).

211221222210221 is a wasteful number, since it uses less digits than its factorization.

211221222210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778371.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 211221222210221 its reverse (122012222122112), we get a palindrome (333233444332333).

The spelling of 211221222210221 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred ten thousand, two hundred twenty-one".