212222201221220 has 12 divisors (see below), whose sum is σ = 445666622564604. Its totient is φ = 84888880488480.

The previous prime is 212222201221189. The next prime is 212222201221279. The reversal of 212222201221220 is 22122102222212.

It can be written as a sum of positive squares in 2 ways, for example, as 49083503545444 + 163138697675776 = 7005962^2 + 12772576^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5305555030511 + ... + 5305555030550.

It is an arithmetic number, because the mean of its divisors is an integer number (37138885213717).

Almost surely, 2^{212222201221220} is an apocalyptic number.

212222201221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212222201221220 is an abundant number, since it is smaller than the sum of its proper divisors (233444421343384).

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

212222201221220 is a wasteful number, since it uses less digits than its factorization.

212222201221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611110061070 (or 10611110061068 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 212222201221220 its reverse (22122102222212), we get a palindrome (234344303443432).

The spelling of 212222201221220 in words is "two hundred twelve trillion, two hundred twenty-two billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty".