1222021201221 has 48 divisors (see below), whose sum is σ = 1833187334784. Its totient is φ = 783792277632.

The previous prime is 1222021201199. The next prime is 1222021201237. The reversal of 1222021201221 is 1221021202221.

It is a happy number.

1222021201221 is a `hidden beast` number, since 1 + 2 + 220 + 21 + 201 + 221 = 666.

It is not a de Polignac number, because 1222021201221 - 2⁵ = 1222021201189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222021201194 and 1222021201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222021201321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23194110 + ... + 23246736.

It is an arithmetic number, because the mean of its divisors is an integer number (38191402808).

Almost surely, 2^{1222021201221} is an apocalyptic number.

It is an amenable number.

1222021201221 is a deficient number, since it is larger than the sum of its proper divisors (611166133563).

1222021201221 is a wasteful number, since it uses less digits than its factorization.

1222021201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53450 (or 53447 counting only the distinct ones).

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

Adding to 1222021201221 its reverse (1221021202221), we get a palindrome (2443042403442).

The spelling of 1222021201221 in words is "one trillion, two hundred twenty-two billion, twenty-one million, two hundred one thousand, two hundred twenty-one".