20212120001220 has 192 divisors, whose sum is σ = 68764320092160. Its totient is φ = 4335668992512.

The previous prime is 20212120001149. The next prime is 20212120001233. The reversal of 20212120001220 is 2210002121202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20212120001220.

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 63 ways as a sum of consecutive naturals, for example, 19227190 + ... + 20251149.

It is an arithmetic number, because the mean of its divisors is an integer number (358147500480).

Almost surely, 2^{20212120001220} is an apocalyptic number.

20212120001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212120001220 is an abundant number, since it is smaller than the sum of its proper divisors (48552200090940).

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

20212120001220 is a wasteful number, since it uses less digits than its factorization.

20212120001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39478434 (or 39478432 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20212120001220 its reverse (2210002121202), we get a palindrome (22422122122422).

The spelling of 20212120001220 in words is "twenty trillion, two hundred twelve billion, one hundred twenty million, one thousand, two hundred twenty".