1212001220000 has 120 divisors (see below), whose sum is σ = 3045147690816. Its totient is φ = 474485216000.

The previous prime is 1212001219951. The next prime is 1212001220009. The reversal of 1212001220000 is 221002121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1212001220009) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 295319 + ... + 1584681.

Almost surely, 2^{1212001220000} is an apocalyptic number.

1212001220000 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 1212001220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1522573845408).

1212001220000 is an abundant number, since it is smaller than the sum of its proper divisors (1833146470816).

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

1212001220000 is an equidigital number, since it uses as much as digits as its factorization.

1212001220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289440 (or 1289417 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1212001220000 its reverse (221002121), we get a palindrome (1212222222121).

The spelling of 1212001220000 in words is "one trillion, two hundred twelve billion, one million, two hundred twenty thousand".