1212202222221 has 64 divisors (see below), whose sum is σ = 1796121722880. Its totient is φ = 724115013120.

The previous prime is 1212202222157. The next prime is 1212202222229. The reversal of 1212202222221 is 1222222022121.

It is not a de Polignac number, because 1212202222221 - 2⁶ = 1212202222157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212202222229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 60864961 + ... + 60884873.

It is an arithmetic number, because the mean of its divisors is an integer number (28064401920).

Almost surely, 2^{1212202222221} is an apocalyptic number.

It is an amenable number.

1212202222221 is a deficient number, since it is larger than the sum of its proper divisors (583919500659).

1212202222221 is a wasteful number, since it uses less digits than its factorization.

1212202222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20746.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 1212202222221 its reverse (1222222022121), we get a palindrome (2434424244342).

The spelling of 1212202222221 in words is "one trillion, two hundred twelve billion, two hundred two million, two hundred twenty-two thousand, two hundred twenty-one".