1221001002212 has 6 divisors (see below), whose sum is σ = 2136751753878. Its totient is φ = 610500501104.

The previous prime is 1221001002211. The next prime is 1221001002223. The reversal of 1221001002212 is 2122001001221.

It can be written as a sum of positive squares in only one way, i.e., 1152260552356 + 68740449856 = 1073434^2 + 262184^2 .

It is not an unprimeable number, because it can be changed into a prime (1221001002211) 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 as a sum of consecutive naturals, namely, 152625125273 + ... + 152625125280.

It is an arithmetic number, because the mean of its divisors is an integer number (356125292313).

Almost surely, 2^{1221001002212} is an apocalyptic number.

It is an amenable number.

1221001002212 is a deficient number, since it is larger than the sum of its proper divisors (915750751666).

1221001002212 is a wasteful number, since it uses less digits than its factorization.

1221001002212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305250250557 (or 305250250555 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221001002212 its reverse (2122001001221), we get a palindrome (3343002003433).

Subtracting 1221001002212 from its reverse (2122001001221), we obtain a palindrome (900999999009).

The spelling of 1221001002212 in words is "one trillion, two hundred twenty-one billion, one million, two thousand, two hundred twelve".