201221010221220 has 72 divisors (see below), whose sum is σ = 665858615647680. Its totient is φ = 48780850962240.

The previous prime is 201221010221219. The next prime is 201221010221237. The reversal of 201221010221220 is 22122010122102.

It is a happy number.

201221010221220 is a `hidden beast` number, since 2 + 0 + 1 + 2 + 210 + 10 + 221 + 220 = 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 = 201221010221193 and 201221010221202.

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 23 ways as a sum of consecutive naturals, for example, 50813384440 + ... + 50813388399.

It is an arithmetic number, because the mean of its divisors is an integer number (9248036328440).

Almost surely, 2^{201221010221220} is an apocalyptic number.

201221010221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221010221220 is an abundant number, since it is smaller than the sum of its proper divisors (464637605426460).

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

201221010221220 is a wasteful number, since it uses less digits than its factorization.

201221010221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101626772865 (or 101626772860 counting only the distinct ones).

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

Adding to 201221010221220 its reverse (22122010122102), we get a palindrome (223343020343322).

The spelling of 201221010221220 in words is "two hundred one trillion, two hundred twenty-one billion, ten million, two hundred twenty-one thousand, two hundred twenty".