1222001222221 has 8 divisors (see below), whose sum is σ = 1316040569144. Its totient is φ = 1127967482880.

The previous prime is 1222001222209. The next prime is 1222001222227. The reversal of 1222001222221 is 1222221002221.

It can be written as a sum of positive squares in 4 ways, for example, as 266467602025 + 955533620196 = 516205^2 + 977514^2 .

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 1222001222221 - 2²⁹ = 1221464351309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222001222227) 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 7 ways as a sum of consecutive naturals, for example, 943740 + ... + 1826101.

It is an arithmetic number, because the mean of its divisors is an integer number (164505071143).

Almost surely, 2^{1222001222221} is an apocalyptic number.

It is an amenable number.

1222001222221 is a deficient number, since it is larger than the sum of its proper divisors (94039346923).

1222001222221 is a wasteful number, since it uses less digits than its factorization.

1222001222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803791.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1222001222221 its reverse (1222221002221), we get a palindrome (2444222224442).

The spelling of 1222001222221 in words is "one trillion, two hundred twenty-two billion, one million, two hundred twenty-two thousand, two hundred twenty-one".