1212221022221 has 8 divisors (see below), whose sum is σ = 1350559592064. Its totient is φ = 1078571895520.

The previous prime is 1212221022197. The next prime is 1212221022283. The reversal of 1212221022221 is 1222201222121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212221022221 - 2⁶ = 1212221022157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212221022193 and 1212221022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221022821) 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, 1172360240 + ... + 1172361273.

It is an arithmetic number, because the mean of its divisors is an integer number (168819949008).

Almost surely, 2^{1212221022221} is an apocalyptic number.

1212221022221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212221022221 is a deficient number, since it is larger than the sum of its proper divisors (138338569843).

1212221022221 is a wasteful number, since it uses less digits than its factorization.

1212221022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344721571.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1212221022221 its reverse (1222201222121), we get a palindrome (2434422244342).

The spelling of 1212221022221 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, twenty-two thousand, two hundred twenty-one".