20212212212220 has 144 divisors (see below), whose sum is σ = 65837950174080. Its totient is φ = 4619661411456.

The previous prime is 20212212212209. The next prime is 20212212212221. The reversal of 20212212212220 is 2221221221202.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212212212221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51864451 + ... + 52252709.

It is an arithmetic number, because the mean of its divisors is an integer number (457207987320).

Almost surely, 2^{20212212212220} is an apocalyptic number.

20212212212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212212212220 is an abundant number, since it is smaller than the sum of its proper divisors (45625737961860).

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

20212212212220 is a wasteful number, since it uses less digits than its factorization.

20212212212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405992 (or 405983 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 20212212212220 its reverse (2221221221202), we get a palindrome (22433433433422).

The spelling of 20212212212220 in words is "twenty trillion, two hundred twelve billion, two hundred twelve million, two hundred twelve thousand, two hundred twenty".