1221200200012 has 24 divisors (see below), whose sum is σ = 2357626656672. Its totient is φ = 549883766400.

The previous prime is 1221200199997. The next prime is 1221200200061. The reversal of 1221200200012 is 2100020021221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 1221200199965 and 1221200200001.

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, 286395664 + ... + 286399927.

It is an arithmetic number, because the mean of its divisors is an integer number (98234444028).

Almost surely, 2^{1221200200012} is an apocalyptic number.

It is an amenable number.

1221200200012 is a deficient number, since it is larger than the sum of its proper divisors (1136426456660).

1221200200012 is a wasteful number, since it uses less digits than its factorization.

1221200200012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572795649 (or 572795647 counting only the distinct ones).

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

Adding to 1221200200012 its reverse (2100020021221), we get a palindrome (3321220221233).

The spelling of 1221200200012 in words is "one trillion, two hundred twenty-one billion, two hundred million, two hundred thousand, twelve".