1212210122221 has 8 divisors (see below), whose sum is σ = 1385428181120. Its totient is φ = 1039003359408.

The previous prime is 1212210122161. The next prime is 1212210122251. The reversal of 1212210122221 is 1222210122121.

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

It is not a de Polignac number, because 1212210122221 - 2¹⁷ = 1212209991149 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 (1212210122251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2592801 + ... + 3024406.

It is an arithmetic number, because the mean of its divisors is an integer number (173178522640).

Almost surely, 2^{1212210122221} is an apocalyptic number.

It is an amenable number.

1212210122221 is a deficient number, since it is larger than the sum of its proper divisors (173218058899).

1212210122221 is an equidigital number, since it uses as much as digits as its factorization.

1212210122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5648043.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1212210122221 its reverse (1222210122121), we get a palindrome (2434420244342).

The spelling of 1212210122221 in words is "one trillion, two hundred twelve billion, two hundred ten million, one hundred twenty-two thousand, two hundred twenty-one".