221221020012210 has 48 divisors (see below), whose sum is σ = 605447002143360. Its totient is φ = 55887415581600.

The previous prime is 221221020012203. The next prime is 221221020012257. The reversal of 221221020012210 is 12210020122122.

It is a happy number.

221221020012210 is a `hidden beast` number, since 2 + 21 + 221 + 0 + 200 + 1 + 221 + 0 = 666.

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 (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64684507066 + ... + 64684510485.

It is an arithmetic number, because the mean of its divisors is an integer number (12613479211320).

Almost surely, 2^{221221020012210} is an apocalyptic number.

221221020012210 is an abundant number, since it is smaller than the sum of its proper divisors (384225982131150).

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

221221020012210 is a wasteful number, since it uses less digits than its factorization.

221221020012210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129369017583 (or 129369017580 counting only the distinct ones).

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

Adding to 221221020012210 its reverse (12210020122122), we get a palindrome (233431040134332).

The spelling of 221221020012210 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, twenty million, twelve thousand, two hundred ten".