1221200213000 has 64 divisors (see below), whose sum is σ = 2897856673920. Its totient is φ = 481600056000.

The previous prime is 1221200212889. The next prime is 1221200213027. The reversal of 1221200213000 is 3120021221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8529002 + ... + 8671001.

It is an arithmetic number, because the mean of its divisors is an integer number (45279010530).

Almost surely, 2^{1221200213000} is an apocalyptic number.

1221200213000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221200213000 is an abundant number, since it is smaller than the sum of its proper divisors (1676656460920).

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

1221200213000 is a wasteful number, since it uses less digits than its factorization.

1221200213000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17200095 (or 17200081 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1221200213000 its reverse (3120021221), we get a palindrome (1224320234221).

The spelling of 1221200213000 in words is "one trillion, two hundred twenty-one billion, two hundred million, two hundred thirteen thousand".