1221020200012 has 48 divisors (see below), whose sum is σ = 2214731352960. Its totient is φ = 588322167552.

The previous prime is 1221020199989. The next prime is 1221020200079. The reversal of 1221020200012 is 2100020201221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221020199965 and 1221020200001.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 158016093 + ... + 158023819.

It is an arithmetic number, because the mean of its divisors is an integer number (46140236520).

Almost surely, 2^{1221020200012} is an apocalyptic number.

It is an amenable number.

1221020200012 is a deficient number, since it is larger than the sum of its proper divisors (993711152948).

1221020200012 is a wasteful number, since it uses less digits than its factorization.

1221020200012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10210 (or 10208 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1221020200012 its reverse (2100020201221), we get a palindrome (3321040401233).

The spelling of 1221020200012 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred thousand, twelve".