1220120211000 has 128 divisors (see below), whose sum is σ = 3816086414400. Its totient is φ = 324569548800.

The previous prime is 1220120210977. The next prime is 1220120211019. The reversal of 1220120211000 is 1120210221.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 31 ways as a sum of consecutive naturals, for example, 729804 + ... + 1724196.

Almost surely, 2^{1220120211000} is an apocalyptic number.

1220120211000 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 1220120211000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1908043207200).

1220120211000 is an abundant number, since it is smaller than the sum of its proper divisors (2595966203400).

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

1220120211000 is a wasteful number, since it uses less digits than its factorization.

1220120211000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994826 (or 994812 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1220120211000 its reverse (1120210221), we get a palindrome (1221240421221).

The spelling of 1220120211000 in words is "one trillion, two hundred twenty billion, one hundred twenty million, two hundred eleven thousand".