221220012010122 has 24 divisors (see below), whose sum is σ = 479310532349376. Its totient is φ = 73739926106856.

The previous prime is 221220012010117. The next prime is 221220012010159. The reversal of 221220012010122 is 221010210022122.

It is a happy number.

221220012010122 is a `hidden beast` number, since 2 + 212 + 200 + 120 + 10 + 122 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 221220012010095 and 221220012010104.

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 11 ways as a sum of consecutive naturals, for example, 12527493 + ... + 24482199.

It is an arithmetic number, because the mean of its divisors is an integer number (19971272181224).

Almost surely, 2^{221220012010122} is an apocalyptic number.

221220012010122 is an abundant number, since it is smaller than the sum of its proper divisors (258090520339254).

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

221220012010122 is a wasteful number, since it uses less digits than its factorization.

221220012010122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12982762 (or 12982759 counting only the distinct ones).

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

Adding to 221220012010122 its reverse (221010210022122), we get a palindrome (442230222032244).

The spelling of 221220012010122 in words is "two hundred twenty-one trillion, two hundred twenty billion, twelve million, ten thousand, one hundred twenty-two".