1212222002221 has 4 divisors (see below), whose sum is σ = 1212733274944. Its totient is φ = 1211710729500.

The previous prime is 1212222002191. The next prime is 1212222002227. The reversal of 1212222002221 is 1222002222121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212222002221 - 2¹⁷ = 1212221871149 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 (1212222002227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255632805 + ... + 255637546.

It is an arithmetic number, because the mean of its divisors is an integer number (303183318736).

Almost surely, 2^{1212222002221} is an apocalyptic number.

It is an amenable number.

1212222002221 is a deficient number, since it is larger than the sum of its proper divisors (511272723).

1212222002221 is an equidigital number, since it uses as much as digits as its factorization.

1212222002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511272722.

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

Adding to 1212222002221 its reverse (1222002222121), we get a palindrome (2434224224342).

The spelling of 1212222002221 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, two thousand, two hundred twenty-one".