1221310200820 has 24 divisors (see below), whose sum is σ = 2603031296544. Its totient is φ = 481232675616.

The previous prime is 1221310200811. The next prime is 1221310200821. The reversal of 1221310200820 is 280020131221.

It is a junction number, because it is equal to n+sod(n) for n = 1221310200791 and 1221310200800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221310200821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455711422 + ... + 455714101.

It is an arithmetic number, because the mean of its divisors is an integer number (108459637356).

Almost surely, 2^{1221310200820} is an apocalyptic number.

1221310200820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221310200820 is an abundant number, since it is smaller than the sum of its proper divisors (1381721095724).

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

1221310200820 is a wasteful number, since it uses less digits than its factorization.

1221310200820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911425599 (or 911425597 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The spelling of 1221310200820 in words is "one trillion, two hundred twenty-one billion, three hundred ten million, two hundred thousand, eight hundred twenty".