1221202120012 has 12 divisors (see below), whose sum is σ = 2442404240080. Its totient is φ = 523372337136.

The previous prime is 1221202120009. The next prime is 1221202120013. The reversal of 1221202120012 is 2100212021221.

It is a happy number.

1221202120012 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1221202120013) 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, 21807180687 + ... + 21807180742.

Almost surely, 2^{1221202120012} is an apocalyptic number.

It is an amenable number.

1221202120012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1221202120012 is a wasteful number, since it uses less digits than its factorization.

1221202120012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43614361440 (or 43614361438 counting only the distinct ones).

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

Adding to 1221202120012 its reverse (2100212021221), we get a palindrome (3321414141233).

The spelling of 1221202120012 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty thousand, twelve".