221212102102120 has 16 divisors (see below), whose sum is σ = 497727229729860. Its totient is φ = 88484840840832.

The previous prime is 221212102102111. The next prime is 221212102102133. The reversal of 221212102102120 is 21201201212122.

It can be written as a sum of positive squares in 2 ways, for example, as 195088206890404 + 26123895211716 = 13967398^2 + 5111154^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2765151276237 + ... + 2765151276316.

Almost surely, 2^{221212102102120} is an apocalyptic number.

221212102102120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212102102120 is an abundant number, since it is smaller than the sum of its proper divisors (276515127627740).

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

221212102102120 is a wasteful number, since it uses less digits than its factorization.

221212102102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530302552564 (or 5530302552560 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221212102102120 its reverse (21201201212122), we get a palindrome (242413303314242).

The spelling of 221212102102120 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred two million, one hundred two thousand, one hundred twenty".