221021221010120 has 16 divisors (see below), whose sum is σ = 497297747272860. Its totient is φ = 88408488404032.

The previous prime is 221021221010111. The next prime is 221021221010159. The reversal of 221021221010120 is 21010122120122.

It can be written as a sum of positive squares in 2 ways, for example, as 220635552685636 + 385668324484 = 14853806^2 + 621022^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2762765262587 + ... + 2762765262666.

Almost surely, 2^{221021221010120} is an apocalyptic number.

221021221010120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021221010120 is an abundant number, since it is smaller than the sum of its proper divisors (276276526262740).

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

221021221010120 is a wasteful number, since it uses less digits than its factorization.

221021221010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5525530525264 (or 5525530525260 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221021221010120 its reverse (21010122120122), we get a palindrome (242031343130242).

The spelling of 221021221010120 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, ten thousand, one hundred twenty".