221220102010212 has 18 divisors (see below), whose sum is σ = 559195257859238. Its totient is φ = 73740034003392.

The previous prime is 221220102010121. The next prime is 221220102010231. The reversal of 221220102010212 is 212010201022122.

It is a happy number.

221220102010212 is a `hidden beast` number, since 2 + 21 + 220 + 10 + 201 + 0 + 212 = 666.

It can be written as a sum of positive squares in only one way, i.e., 201375001523556 + 19845100486656 = 14190666^2 + 4454784^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 5 ways as a sum of consecutive naturals, for example, 3072501416773 + ... + 3072501416844.

Almost surely, 2^{221220102010212} is an apocalyptic number.

It is an amenable number.

221220102010212 is an abundant number, since it is smaller than the sum of its proper divisors (337975155849026).

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

221220102010212 is a wasteful number, since it uses less digits than its factorization.

221220102010212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6145002833627 (or 6145002833622 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221220102010212 its reverse (212010201022122), we get a palindrome (433230303032334).

The spelling of 221220102010212 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred two million, ten thousand, two hundred twelve".