1201221000000 has 1176 divisors, whose sum is σ = 5138671724160. Its totient is φ = 262310400000.

The previous prime is 1201220999989. The next prime is 1201221000013. The reversal of 1201221000000 is 1221021.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 1448999586 + ... + 1449000414.

Almost surely, 2^{1201221000000} is an apocalyptic number.

1201221000000 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 1201221000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2569335862080).

1201221000000 is an abundant number, since it is smaller than the sum of its proper divisors (3937450724160).

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

1201221000000 is an frugal number, since it uses more digits than its factorization.

1201221000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907 (or 869 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1201221000000 its reverse (1221021), we get a palindrome (1201222221021).

The spelling of 1201221000000 in words is "one trillion, two hundred one billion, two hundred twenty-one million", and thus it is an aban number.