12211211201220 has 576 divisors, whose sum is σ = 41199950937600. Its totient is φ = 2913692221440.

The previous prime is 12211211201209. The next prime is 12211211201237. The reversal of 12211211201220 is 2210211211221.

12211211201220 is a `hidden beast` number, since 1 + 2 + 211 + 211 + 20 + 1 + 220 = 666.

It is a super-2 number, since 2×12211211201220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12211211201193 and 12211211201202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2497688536 + ... + 2497693424.

It is an arithmetic number, because the mean of its divisors is an integer number (71527692600).

Almost surely, 2^{12211211201220} is an apocalyptic number.

12211211201220 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 12211211201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20599975468800).

12211211201220 is an abundant number, since it is smaller than the sum of its proper divisors (28988739736380).

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

12211211201220 is a wasteful number, since it uses less digits than its factorization.

12211211201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5340 (or 5335 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12211211201220 its reverse (2210211211221), we get a palindrome (14421422412441).

The spelling of 12211211201220 in words is "twelve trillion, two hundred eleven billion, two hundred eleven million, two hundred one thousand, two hundred twenty".