212221220000020 has 96 divisors (see below), whose sum is σ = 561135064202496. Its totient is φ = 65491954176000.

The previous prime is 212221219999951. The next prime is 212221220000039. The reversal of 212221220000020 is 20000022122212.

It is a junction number, because it is equal to n+sod(n) for n = 212221219999949 and 212221220000003.

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, 682052317 + ... + 682363396.

It is an arithmetic number, because the mean of its divisors is an integer number (5845156918776).

Almost surely, 2^{212221220000020} is an apocalyptic number.

212221220000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221220000020 is an abundant number, since it is smaller than the sum of its proper divisors (348913844202476).

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

212221220000020 is a wasteful number, since it uses less digits than its factorization.

212221220000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364415841 (or 1364415839 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 212221220000020 its reverse (20000022122212), we get a palindrome (232221242122232).

The spelling of 212221220000020 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred twenty million, twenty", and thus it is an aban number.