12211221220020 has 72 divisors (see below), whose sum is σ = 38651169787776. Its totient is φ = 3114746281152.

The previous prime is 12211221219971. The next prime is 12211221220021. The reversal of 12211221220020 is 2002212211221.

It is a happy number.

12211221220020 is a `hidden beast` number, since 1 + 221 + 1 + 221 + 2 + 200 + 20 = 666.

It is a super-2 number, since 2×12211221220020² (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 = 12211221219975 and 12211221220002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211221220021) 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 23 ways as a sum of consecutive naturals, for example, 1474781032 + ... + 1474789311.

It is an arithmetic number, because the mean of its divisors is an integer number (536821802608).

Almost surely, 2^{12211221220020} is an apocalyptic number.

12211221220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211221220020 is an abundant number, since it is smaller than the sum of its proper divisors (26439948567756).

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

12211221220020 is a wasteful number, since it uses less digits than its factorization.

12211221220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949570381 (or 2949570376 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12211221220020 its reverse (2002212211221), we get a palindrome (14213433431241).

The spelling of 12211221220020 in words is "twelve trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, twenty".