221212210210120 has 16 divisors (see below), whose sum is σ = 497727472972860. Its totient is φ = 88484884084032.

The previous prime is 221212210210051. The next prime is 221212210210151. The reversal of 221212210210120 is 21012012212122.

It can be written as a sum of positive squares in 2 ways, for example, as 192281430767364 + 28930779442756 = 13866558^2 + 5378734^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2765152627587 + ... + 2765152627666.

Almost surely, 2^{221212210210120} is an apocalyptic number.

221212210210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212210210120 is an abundant number, since it is smaller than the sum of its proper divisors (276515262762740).

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

221212210210120 is a wasteful number, since it uses less digits than its factorization.

221212210210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530305255264 (or 5530305255260 counting only the distinct ones).

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

Adding to 221212210210120 its reverse (21012012212122), we get a palindrome (242224222422242).

The spelling of 221212210210120 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred ten million, two hundred ten thousand, one hundred twenty".