20212221210120 has 64 divisors (see below), whose sum is σ = 67374070704000. Its totient is φ = 5389925655744.

The previous prime is 20212221210119. The next prime is 20212221210131. The reversal of 20212221210120 is 2101212221202.

It is a happy number.

20212221210120 is a `hidden beast` number, since 2 + 0 + 212 + 221 + 210 + 1 + 20 = 666.

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 = 20212221210093 and 20212221210102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9357508740 + ... + 9357510899.

It is an arithmetic number, because the mean of its divisors is an integer number (1052719854750).

Almost surely, 2^{20212221210120} is an apocalyptic number.

20212221210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212221210120 is an abundant number, since it is smaller than the sum of its proper divisors (47161849493880).

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

20212221210120 is a wasteful number, since it uses less digits than its factorization.

20212221210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18715019659 (or 18715019649 counting only the distinct ones).

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

Adding to 20212221210120 its reverse (2101212221202), we get a palindrome (22313433431322).

The spelling of 20212221210120 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty".