1211002120000 has 280 divisors, whose sum is σ = 3103594556832. Its totient is φ = 468384000000.

The previous prime is 1211002119983. The next prime is 1211002120007. The reversal of 1211002120000 is 212001121.

It is a super-2 number, since 2×1211002120000² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211002120007) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 173716515 + ... + 173723485.

Almost surely, 2^{1211002120000} is an apocalyptic number.

1211002120000 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 1211002120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1551797278416).

1211002120000 is an abundant number, since it is smaller than the sum of its proper divisors (1892592436832).

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

1211002120000 is an equidigital number, since it uses as much as digits as its factorization.

1211002120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7147 (or 7122 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1211002120000 its reverse (212001121), we get a palindrome (1211214121121).

The spelling of 1211002120000 in words is "one trillion, two hundred eleven billion, two million, one hundred twenty thousand".