1211002012220 has 432 divisors, whose sum is σ = 3569192460288. Its totient is φ = 340982853120.

The previous prime is 1211002012217. The next prime is 1211002012261. The reversal of 1211002012220 is 222102001121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1211002012195 and 1211002012204.

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 143 ways as a sum of consecutive naturals, for example, 85618469 + ... + 85632611.

It is an arithmetic number, because the mean of its divisors is an integer number (8262019584).

Almost surely, 2^{1211002012220} is an apocalyptic number.

1211002012220 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 1211002012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1784596230144).

1211002012220 is an abundant number, since it is smaller than the sum of its proper divisors (2358190448068).

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

1211002012220 is a wasteful number, since it uses less digits than its factorization.

1211002012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14250 (or 14228 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1211002012220 its reverse (222102001121), we get a palindrome (1433104013341).

The spelling of 1211002012220 in words is "one trillion, two hundred eleven billion, two million, twelve thousand, two hundred twenty".