2211201022221 has 6 divisors (see below), whose sum is σ = 3193957032110. Its totient is φ = 1474134014808.

The previous prime is 2211201022201. The next prime is 2211201022279. The reversal of 2211201022221 is 1222201021122.

It is a happy number.

2211201022221 is a `hidden beast` number, since 221 + 1 + 201 + 0 + 22 + 221 = 666.

2211201022221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1965432959721 + 245768062500 = 1401939^2 + 495750^2 .

It is not a de Polignac number, because 2211201022221 - 2⁵ = 2211201022189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2211201022194 and 2211201022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211201022201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122844501226 + ... + 122844501243.

Almost surely, 2^{2211201022221} is an apocalyptic number.

It is an amenable number.

2211201022221 is a deficient number, since it is larger than the sum of its proper divisors (982756009889).

2211201022221 is a wasteful number, since it uses less digits than its factorization.

2211201022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245689002475 (or 245689002472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2211201022221 its reverse (1222201021122), we get a palindrome (3433402043343).

The spelling of 2211201022221 in words is "two trillion, two hundred eleven billion, two hundred one million, twenty-two thousand, two hundred twenty-one".