1221020201212 has 24 divisors (see below), whose sum is σ = 2488116639456. Its totient is φ = 513420892608.

The previous prime is 1221020201179. The next prime is 1221020201227. The reversal of 1221020201212 is 2121020201221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411393463 + ... + 411396430.

It is an arithmetic number, because the mean of its divisors is an integer number (103671526644).

Almost surely, 2^{1221020201212} is an apocalyptic number.

It is an amenable number.

1221020201212 is an abundant number, since it is smaller than the sum of its proper divisors (1267096438244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221020201212 is a wasteful number, since it uses less digits than its factorization.

1221020201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822789957 (or 822789955 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221020201212 its reverse (2121020201221), we get a palindrome (3342040402433).

Subtracting 1221020201212 from its reverse (2121020201221), we obtain a palindrome (900000000009).

The spelling of 1221020201212 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred one thousand, two hundred twelve".