212221212221220 has 24 divisors (see below), whose sum is σ = 594219394219584. Its totient is φ = 56592323258976.

The previous prime is 212221212221209. The next prime is 212221212221267. The reversal of 212221212221220 is 22122212122212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1768510101784 + ... + 1768510101903.

It is an arithmetic number, because the mean of its divisors is an integer number (24759141425816).

Almost surely, 2^{212221212221220} is an apocalyptic number.

212221212221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221212221220 is an abundant number, since it is smaller than the sum of its proper divisors (381998181998364).

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

212221212221220 is a wasteful number, since it uses less digits than its factorization.

212221212221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537020203699 (or 3537020203697 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 212221212221220 its reverse (22122212122212), we get a palindrome (234343424343432).

The spelling of 212221212221220 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty".