1221301203000 has 256 divisors, whose sum is σ = 3938194391040. Its totient is φ = 314788608000.

The previous prime is 1221301202983. The next prime is 1221301203151. The reversal of 1221301203000 is 3021031221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 80251392 + ... + 80266608.

It is an arithmetic number, because the mean of its divisors is an integer number (15383571840).

Almost surely, 2^{1221301203000} is an apocalyptic number.

1221301203000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221301203000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1969097195520).

1221301203000 is an abundant number, since it is smaller than the sum of its proper divisors (2716893188040).

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

1221301203000 is a wasteful number, since it uses less digits than its factorization.

1221301203000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16135 (or 16121 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 1221301203000 its reverse (3021031221), we get a palindrome (1224322234221).

The spelling of 1221301203000 in words is "one trillion, two hundred twenty-one billion, three hundred one million, two hundred three thousand".