211002222001220 has 96 divisors (see below), whose sum is σ = 480296167596000. Its totient is φ = 77401463353344.

The previous prime is 211002222001211. The next prime is 211002222001243. The reversal of 211002222001220 is 22100222200112.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 364545458176 + 210637676543044 = 603776^2 + 14513362^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294730256 + ... + 295445304.

It is an arithmetic number, because the mean of its divisors is an integer number (5003085079125).

Almost surely, 2^{211002222001220} is an apocalyptic number.

211002222001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211002222001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240148083798000).

211002222001220 is an abundant number, since it is smaller than the sum of its proper divisors (269293945594780).

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

211002222001220 is a wasteful number, since it uses less digits than its factorization.

211002222001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722457 (or 722455 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 211002222001220 its reverse (22100222200112), we get a palindrome (233102444201332).

It can be divided in two parts, 211002 and 222001220, that added together give a palindrome (222212222).

The spelling of 211002222001220 in words is "two hundred eleven trillion, two billion, two hundred twenty-two million, one thousand, two hundred twenty".